Ең жақсы онкологияның онкологтар - ЖОҒ-660 дәрігерлер

2023 – Istanbul Gaziosmanpaşa Taksim Education and Research Hospital – General Surgery Clinic Associate Professor

2013 – Istanbul Gaziosmanpaşa Taksim Education and Research Hospital – General Surgery Clinic Specialist

2008 – 2013 Private Medical Park Fatih Hospital, General Surgery Specialist - Deputy Chief Physician

2005 – 2007 Private Gelişim Hospital – General Surgery Specialist

2003 – 2005 Private Istanbul Şafak Hospital – General Surgery Specialist - Chief Physician

2002 – 2003 ISTANBUL HASEKİ EDUCATION AND RESEARCH HOSPITAL – General Surgery Clinic Assistant Physician

1998 – 2002 Ankara Education and Research Hospital – General Surgery Clinic Assistant Physician

1998 – Health Sciences University – Istanbul Haseki Health Application and Research Center – Medical Specialization

1991 – Gazi University Faculty of Medicine – Bachelor’s Degree

Certificates

IGM Diagnosis, Treatment Workshop, Granulomatous Mastitis, Kocaeli, Certificate, 07.10.2023 (National)

ibreast 51- Free Flap Reconstruction, Breast Cancer Surgery, Online, Certificate, 30.09.2023 – 30.09.2023 (International)

ibreast 50- Triple Negative Breast Cancer, Breast Cancer, Online, Certificate, 02.09.2023 -02.09.2023 (International)

ibreast 49- Implant Based Reconstruction, Breast Cancer, Online, Certificate, 12.08.2023 -12.08.2023 (International)

ibreast 48- DCIS, İbreast 48- DCIS, Online, Certificate, 15.07.2023 -15.07.2023 (International)

ibreast 47- Conference Updates, Breast Cancer, Online, Certificate, 25.06.2023 -25.06.2023 (International)

ibreast 46- Margin Revisited, Breast Cancer, Online, Certificate, 10.06.2023 -10.06.2023 (International)

1. International 4. National Breast Surgery Congress, Breast Surgery, Ürgüp, Certificate, 05.05.2023 – 07.05.2023 (International)

ibreast 44- HER2 Positive Disease, Breast Cancer, Online, Certificate, 29.04.2023 -29.04.2023 (International)

St-Gallen 2023, St-Gallen Congress Summary Meeting, Istanbul, Certificate, 01.04.2023 -01.04.2023 (National)

ibreast 43- Save The Nipple, Breast Cancer, Online, Certificate, 25.03.2023 -25.03.2023 (International)

ibreast 42-Chest Wall Perforator Flap Revisited, Breast Cancer, Online, Certificate, 25.02.2023 -25.02.2023 (International)

ibreast 41- High Risk And B3 Lesions, Breast Diseases, Online, Certificate, 28.01.2023 -28.01.2023 (International)

15. New Approaches in Breast Cancer Education Meeting, Breast Cancer, Istanbul, Certificate, 07.01.2023 – 08.01.2023 (National)

Articles she wrote and took part in;

1.YILDIRIM EMİNE, BEKTAŞ SİBEL, YETİŞ FIRAT, YILDIZ EREN OZAN, ÖZDEMİR MUHAMMED, KOMUT NESLİHAN, ÇALIK MUSTAFA, ER AHMET MUZAFFER. Correlation between breast and axillary pathologic complete response after neoadjuvant chemotherapy in breast cancer. Annali Italiani di Chirurgia, 2023

2.UZUN NEDİM, YILDIRIM EMİNE. Relationship Between Toilet Type and Hemorrhoids. Bezmialem Vakif University, 2022

3.YILDIZ EREN OZAN, YILDIRIM EMİNE, ORHUN ERDOĞAN KIVILCIM, ERYILMAZ İKLİL, YÜNLÜEL EMİR MEHMET, YETİŞ FIRAT, ULUKENT SUAT CAN. The effect of the covid 19 pandemic on the number of patients treated for acute and complex acute appendicitis. Annali Italiani di Chirurgia, 2202

4.YILDIRIM EMİNE, BEKTAŞ SİBEL, ÖZDEMİR MUHAMMED, KARAGÜLLE AHENK, ER AHMET MUZAFFER, UÇAR NEŞE. Upgrade Rates of DCIS, Intraductal Papilloma, and the Other High-risk Breast Lesions. Hamidiye Medical Journal, 2022
 

5.ÖZKAN GÜMÜŞKAYA PERİHAN, ALTUN ÖZGÜR, KARAKÜTÜK YÜZTAŞ NUR, ÖZSOY NESLİHAN, AYDIN TUTAK GÜLTEN, YILDIRIM EMİNE, ADAŞ MİNE, KÜÇÜK MEHMET. COVID-19 Pnömonisi Sonrası AntiHBs Değerlerindeki Değişiklikler. Journal of Contemporary Medicine, 2022;12(4), 

6.KOMUT NESLİHAN, BEKTAŞ SİBEL, YILDIRIM EMİNE. The relationship of tumor budding with GOLPH3 expression and histopathological prognostic parameters in colorectal adenocarcinoma. Annals of Diagnostic Pathology 2022 Jun;58:151933. 

7.KAYADİBİ YASEMİN, UÇAR NEŞE, AKAN YEŞİM NAMDAR, KAYA MEHMET FATİH, YILDIRIM EMİNE, ALADAĞ KURT SEDA, SOYLU BOY FATMA NUR, TAŞKIN FÜSUN, İÇTEN GÜL ESEN. Magnetic resonance imaging findings associated with recurrence in idiopathic granulomatous mastitis. Clinical Imaging, 2022

8.YILDIRIM EMİNE, KEĞİN MURAT, ÖZDEMİR MUHAMMED, BEKTAŞ SİBEL, PELEN ZEKERİYA, ER AHMET MUZAFFER. Neoplasms of theAppendix; Single Institution and Ten-Year Experiences Results. Turkish Journal of Trauma and Emergency Surgery, 2022;28(3), 352-360

9.YILDIRIM EMİNE, YILDIZ EREN OZAN, ERYILMAZ İKLİL, ER AHMET MUZAFFER, BEKTAŞ SİBEL. Comparison of excised breast volume, re-excision rate and margin positivity in breast-conserving surgery in breast cancer patients using and not using neoadjuvant chemotherapy. Journal of Surgery in Medicine,2022;6

10.YILDIRIM EMİNE, BEKTAŞ SİBEL, PELEN ZEKERİYA, YANIK İREM, ER AHMET MUZAFFER, ÇENGEL FERHAT, ÖZKAN GÜMÜŞKAYA PERİHAN. Histopathological, Radiological, and Demographic Factors Predicting the Response to Neoadjuvant Therapy for Rectal Cancer. Journal of Gastrointestinal Cancer, 2022;53(1)

11.KAYADİBİ YASEMİN, KOÇAK BURAK, UÇAR NEŞE, AKAN YEŞİM NAMDAR, YILDIRIM EMİNE, BEKTAŞ SİBEL. MRI Radiomics of Breast Cancer: Machine Learning-Based Prediction of Lymphovascular Invasion Status. Academic Radiology, 2022;29(1), 126-134.

12.YILDIRIM EMİNE, UÇAR NEŞE, YETİŞ FIRAT, KAYADİBİ YASEMİN, BEKTAŞ SİBEL. Diagnostic performance of breast imaging with ultrasonography, magnetic resonance and mammography in the assessment of residual tumor after neoadjuvant chemotherapy in breast cancer patients. Journal of Surgery and Medicine, 2022;6(1), 43-48

13.YILDIRIM EMİNE, BEKTAŞ SİBEL, GÖKTAŞ AYDIN SABİN, ER AHMET MUZAFFER, YANIK İREM, ÖZKAN GÜMÜŞKAYA PERİHAN, YILMAZ BARBAROS UTKU, BİLİCİ AHMET, ÖNCEL MUSTAFA. Factors Predicting Response to Neoadjuvant Chemotherapy in Locally Advanced Gastric Cancer. Journal of Istanbul Faculty of Medicine / İstanbul Tıp Fakültesi Dergisi, 2022;85(1), 41-50. 

14.YILDIRIM EMİNE, Pelen Zekeriya, KEĞİN MURAT, UÇAR NEŞE, KAYADİBİ YASEMİN, GÜNDOĞAR ÖZGECAN. Evaluation of the Reliability of Preoperative Ultrasonography and Ultrasonography-Guided Fine Needle Aspiration Biopsy in Axillary Staging in Patients With Breast Cancer. Journal of Academic Research in Medicine, 2021;11(3), 269-276., 

15. KAYADİBİ YASEMİN, UÇAR NEŞE, KAYA MEHMET FATİH, YILDIRIM EMİNE, BEKTAŞ SİBEL. Characterization of Suspicious Microcalcifications on Mammography Using 2D Shear-Wave Elastography. Ultrasound in Medicine & Biology, 2022;47(9), 2532-2542. 

16.KAYADİBİ YASEMİN, TEKCAN ŞANLI DENİZ ESİN, UÇAR NEŞE, YILDIRIM EMİNE, ŞANLI AHMET NECATİ. Evaluation of the Appearance Characteristics of Suspicious Microcalcifications Detected by Ultrasonography. Journal of Academic Research in Medicine, 2022;11(2), 199-205. 

17.YILDIRIM EMİNE, ÖZER HİLAL, ÖZER İLTER, KOYUNCU ADİL, YILDIRIM TİMUR. The Effects on Bacterial Translocation and Tissue Damage of Selenium Treatment in an Experimental Intestinal Ischaemia-Reperfusion Model. Turkish Journal of Trauma and Emergency Surgery, 2021;27(4), 389-394. 

18.YILDIRIM EMİNE, AKBAŞ PELİN, ORHUN ERDOĞAN KIVILCIM, BEKTAŞ SİBEL, ÖZKAN GÜMÜŞKAYA PERİHAN, ER AHMET MUZAFFER, PALTURA CEKİ. The comparison of the histopathological results of the thyroid fine-needle aspiration biopsies in the 795 patients with thyroidectomy. Diagnostic Cytopathology, 2021

Prof. Thomas W Kraus is a renowned gastrointestinal doctor in Germany with over 30 years of experience and 3,000+ surgical interventions performed. He specializes in Whipple procedure management, stomach oncology and treatment of liver diseases, and is the Chief Physician in Nordwest Clinic in Francfurt am Main. Prof. Kraus is a member of several prestigious national and international medical associations, and has received numerous awards for his achievements. He has a wide range of surgical services, including laparotomy, laparoscopy, radical resection, draining of inflammatory diseases, bile ducts surgical reconstruction, bypass, stapling of the damaged bile ducts, endoscopic correction of hernias, and more.

Dr. Ivan Colombo is an experienced Urologist with 30 years of experience and specialization in Robotic Surgery, Urological diseases treatment, and Oncourology. He is currently working at St. Zdislava hospital and is a member of various reputable organizations, including the Urology Society of Czech Republic, Surgical Society of Czech, Robotic surgery association, European Urology Association, American Urology Society, and International Urology society. He has also published over 150 papers in national and international journals.

Dr. Francesc Graus is a neurologist with expertise in paraneoplastic neurological syndromes, gliomas, and primary brain lymphomas. He established the first strict diagnostic criteria for paraneoplastic syndromes. He also identified important antibodies that are now used in diagnosis. His research showed the link between tumors and autoimmune neurological attacks.

Dr. Graus earned his MD and PhD from Universitat Autònoma de Barcelona. He completed his neurology residency in Barcelona and a neuro-oncology fellowship at Memorial Sloan-Kettering Cancer Center. He is an Emeritus investigator at IDIBAPS. He founded and served as president of the European Association of Neuro-Oncology. He is also the former chief of neurology at Hospital Clinic Barcelona.

Dr. Enriqueta Felip is an expert in thoracic oncology. She specializes in lung cancer care and clinical trials. She earned her medical degree and PhD from UAB. Dr. Felip has led research on improving chemotherapy, developing new therapies, using immunotherapy, and understanding resistance to targeted treatments.

She served as a board member of the IASLC from 2017 to 2021 and was Vice-President of SEOM from 2019 to 2021. In 2015, she received the first ESMO Women for Oncology Award. Dr. Felip has written many peer-reviewed articles and book chapters. She is known for her leadership in international oncology societies and clinical research.

Dr. Jesus Soberino is an oncologist at Vall d’Hebron University Hospital and the Vall d’Hebron Institute of Oncology (VHIO). He specializes in breast cancer and melanoma. Dr. Soberino has led many phase 1–3 clinical trials. His work has helped approve important drugs, including CDK4/6 inhibitors for metastatic breast cancer and immunotherapies for melanoma.

His areas of expertise include endocrine therapy, managing hormone resistance, and developing new immunotherapies. Dr. Soberino is known for his patient-centered care. He actively collaborates in research to improve cancer treatment. He is accredited by VHIO and is a key member of the Breast Cancer and Melanoma Units.

Dr. Jaume Mora Graupera is a pediatric oncologist specializing in the treatment of neuroblastomas, gliomas, Ewing's sarcomas, and Wilms' tumors. He is the Director of the Hematology Oncology Department and Developmental Tumors Laboratory at Sant Joan De Déu - Barcelona Children’s Hospital. He received his medical degree from the University of Barcelona, went on to complete specialty training in pediatrics and fellowships in pediatric hematology oncology and molecular pathology of pediatric cancer at Weill Cornell Medicine and Memorial Sloan Kettering Cancer Center in the USA. He has won multiple awards and is a member of various medical organizations.

Education and Career

2011 – 2015, (Internal Medicine Specialist) Istanbul University Istanbul School of Education and Career

Medicine Department of Internal Medicine

2015 – 2016, (Internal Medicine) Specialist Istanbul Haydarpasa Numune Training and Research Hospital

2016 – 2019, (Medical Oncology) Istanbul University Istanbul School of Medicine Department of Medical Oncology

2019 – 2021, (Medical Oncology Specialist) - Istanbul Haydarpasa Numune Training and Research Hospital

2021 – 2024, (Associate Professor) Marmara University School of Medicine Department of Medical Oncology

Memberships in Scientific Organizations

ASCO

ESMO

TTOD 

AVOD 

Publications

In the field of oncology, he has published over 30 peer-reviewed articles at both international and national levels.

Awards Received

EAACI The European Academy of Allergy and Clinical Immunology 2019 Best Poster Award

"The top 3rd verbal presentation, IGICC (11th International Gastrointestinal Cancers Conference – IGICC2021)"

Speeches Delivered at National Congresses, Conferences, and Symposia:

Courses, Meetings, and Certificates

ESMO certified Medical Oncologist since 2019

Education

09 / 2004 – 07 / 2006                Movie Director School, ANT1 Movie School Athens, Greece, Degree “Television Director”, grade point average: B

09 / 2006 – 08 / 2008                Medical School, Semmelweis University Budapest, Hungary, Medical preliminary examination (Physikum), grade point average: A

10 / 2008 – 05 / 2013                Medical School, Albert-Ludwigs-Universität Freiburg, Germany, State examination in medicine, grade point average: A

02/ 2009 – 02/2012                   Institute of Pharamcology and Toxicology I, Albert-Ludwigs-Universität Freiburg, Germany, Doctoral thesis, grade: summa cum laude

05 / 2018                                      Basic and advanced course in German drug law and GCP, Clinical Trials Unit, Medical Center - University of Freiburg

01 / 2019                                      Board certification: Radiotherapy and Radiation Oncology

03 / 2020                                      Medical Center University of Freiburg, Department of Radiation Oncology, Germany, Habilitation (Postdoctoral lecture qualification)

09 / 21 – 08 / 23                         MHBA, Friedrich Alexander University, Nuernberg, Germany

07 / 2022                                      Completion of ISO 9001:2015 training, Nicosia, Cyprus

Professional Career

09 / 2013 – 01 / 2019               Medical Center University of Freiburg, Department of Radiation Oncology, Germany, Residency                                                

07 / 2017 – 07 / 2020               Bertha-Ottenstein programme, Medical Center, University of Freiburg, Germany, Clinician Scientist

Since 06 / 2019                          Medical Center University of Freiburg, Department of Radiation Oncology, Germany, Consultant

01 / 2021 – 12 / 2022                Bertha-Ottenstein programme, Medical Center, University of Freiburg, Germany, Advanced Clinician Scientist

01 / 2021 – 12 / 2021                 Head of the section “Interventional Radiation Oncology”, Medical Center University of Freiburg, Department of Radiation Oncology, Germany

Since 01 / 2022                         Medical Center University of Freiburg, Department of Radiation Oncology, Germany, Prostate cancer research group leader

Since 01 / 2022                          German Medical Institute, Limassol, Cyprus, Vice Medical Director

Professional Memberships and Distinctions

2010           Sanofi-Aventis poster prize, Annual meeting of the German Society of Pharmacology and Toxicology 2010, Mainz, Germany      

2017           Poster prize, Annual meeting of the German Society of Radiation Oncology (DEGRO) 2017, Berlin, Germany

2019           Poster prize, Uro-Oncological Symposium 2019, Magdeburg, Germany

2020           Invited member of the German expert panel for prostate cancer of the German Society of Radiation Oncology (DEGRO)

2020           Herman-Holthusen Award, German Society of Radiation Oncology (DEGRO)

2021           Invited member of the ESTRO-ACROP guideline committee for prostate cancer

2021           Best Abstract, EMUC congress 2021, Athens, Greece

2023           Annual ARO study price for the HypoFocal-SBRT study from the German Cancer Foundation

2023           Invited member of the ESTRO focus group “Urology”

• Education: 
•  
• 2001-2007: University of Ioannina Medical School, Greece.
• 2007: Degree in Medicine.
• 2013: Doctoral degree from the Medical School of the Johann Wolfgang Goethe University, Frankfurt (Dr. Med)
• 09.2016 – Today: Master’s in Healthcare Business Studies.

Professional experience:

04.2009 – 04.2013: Resident in the Department for Radiation Oncology, Klinikum Offenbach

05.2013 – 12. 2015: Senior physician in the Department for Radiation Oncology, Klinikum Offenbach

• 01.2016 – 06.2017: Senior physician in the Department of interventional Radiation Oncology, Medical Center Athens
•  
• 07.2017 – Today: Head of the Department of Radiation Oncology at the German Oncology Center, Limassol, Cyprus.

Experience

2022 PRIVATE MEDIPOL BAHÇELİEVLER HOSPITAL

2021 - 2021 Prof. Dr. Cemil Taşçıoğlu City Hospital, Medical Oncology Clinic Education Officer

2021 - 2021 Prof. Dr. Cemil Taşçıoğlu City Hospital

2020 - 2021 Yüzüncü Yıl University Faculty of Medicine

2020 - 2021 Head of the Department of Medical Oncology, Yüzüncü Yıl University Faculty of Medicine, Assoc. Dr.  

2018 - 2021 Lecturer - Yüzüncü Yıl University Faculty of Medicine, Head of Medical Oncology Department  

2018 - 2021 Yüzüncü Yıl University Faculty of Medicine

2015 - 2018 University of Health Sciences, Okmeydanı Training and Research Hospital

2015 - 2018 University of Health Sciences, Okmeydanı Training and Research Hospital, Medical Oncology Clinic, Sub-branch assistant

2012 - 2015 Kanuni Sultan Süleyman Training and Research Hospital, Internal Medicine specialist

2012 - 2015 Suleiman the Magnificent Training and Research Hospital,

2008 - 2012 Haseki Training and Research Hospital

2006 - 2008 Kızıltepe No. 3 Health Center General Practitioner.

Education

2018

İstanbul Okmeydanı Eğitim ve Araştırma Hastanesi, Tıbbı Onkoloji

2018

İstanbul Okmeydanı Eğitim ve Araştırma Hastanesi, Tıbbı Onkoloji, İstanbul Okmeydanı Eğitim ve Araştırma Hastanesi, Tıbbı Onkoloji

2012

İstanbul Haseki Eğitim ve Araştırma Hastanesi, İç Hastalıkları, İstanbul Haseki Eğitim ve Araştırma Hastanesi, İç Hastalıkları

2012

İstanbul Haseki Eğitim ve Araştırma Hastanesi, İç Hastalıkları

2007

Uludağ Üniversitesi Tıip Fakültesi, Tıip Fakültesi, Uludağ Üniversitesi Tıip Fakültesi, Tıip Fakültesi

Experience

2021 year - 2022 year

Clinical Manager of Radiation Oncology, Medicana International Istanbul Hospital

2021 year - 2022 year

Department of Radiation Oncology, Biruni University Faculty of Medicine

2020 year - 2021 year

Clinical Manager of Radiation Oncology, Medicana International Istanbul Hospital

2017 year - 2020 year

Clinical Manager of Radiation Oncology, Neolife Medical Center

2016 year - 2017 year

Department of Radiation Oncology, Eskişehir Osmangazi University Faculty of Medicine

2011 year - 2016 year

Department of Radiation Oncology, Eskişehir Osmangazi University Faculty of Medicine

2010 year - 2011 year

Department of Radiation Oncology, Eskişehir Osmangazi University Faculty of Medicine

2008 year - 2010 year

Radiation Oncology Clinic, Samsun Training and Research Hospital (Education Coordinator)

2006 year

Medical Faculty, Dokuz Eylül University

2006 year - 2008 year

Radiation Oncology Clinic, Samsun Mehmet Aydın State Hospital (Compulsory Service)

2000 year - 2006 year

Medical Faculty, Dokuz Eylül University

Education

2022 year

Biruni University Faculty of Medicine, Department of Radiation Oncology, Faculty Member, Professor Doctor

2022 year

Anadolu University Open Education Faculty Undergraduate Program, Cultural Heritage and Tourism

2021 year

Feyziye Schools Foundation Işık University Health Services Vocational School, Faculty Member, Associate Professor Doctor

2017 year

Eskişehir Osmangazi University Faculty of Medicine, Department of Radiation Oncology, Faculty Member

2017 year

Eskişehir Osmangazi University Faculty of Medicine, Department of Radiation Oncology, Associate Professor Doctor

2006 year

Samsun Training and Research Hospital, Specialist Doctor, Compulsory Service

2006 year

Dokuz Eylül University Faculty of Medicine, Department of Radiation Oncology, Medical Specialization

1998 year

Ege University, Faculty of Medicine

Dr. Michael Lotem leads the Melanoma and Cancer Immunotherapy Center at Hadassah Medical Center. He specializes in advanced immunotherapy for melanoma. He is known for his research on SLAM receptors and their role in anti-cancer immune responses. Dr. Lotem has published widely in leading medical journals.

He heads a multidisciplinary team that uses clinical data and patient samples to advance research. Under his leadership, the center has improved patient outcomes with new therapies. The center is now recognized as a leader in cancer immunotherapy.

Dr. Auala Hubert is a board-certified medical oncologist and radiotherapist with 33 years of clinical experience. She works at Hadassah Medical Center and speaks both English and Hebrew. Dr. Hubert leads the Gastrointestinal Cancer Center. She is also a senior physician in the Oncology Department.

She earned her M.D. from Hadassah University Hospital. She holds board certifications in oncology and radiotherapy. Dr. Hubert has passed USMLE Parts I and II. She is a member of the Israel Society of Clinical Oncology, Israel Medical Society, and Israel Cancer Association. Dr. Hubert also serves on several medical and social service committees, where she helps advance cancer care.

EXPERIENCE

2024 - Present, Istanbul/Turkey

MEMORIAL ŞİŞLİ HOSPITAL

Internal Medicine and Medical Oncology Specialist

2021 - 2024, Istanbul/Turkey

NEW CENTURY UNIVERSITY PRIVATE GOP HOSPITAL

Assistant Professor of Medical Oncology

2017 - 2021, Istanbul/Turkey

ŞİŞLİ ETFAL EDUCATION AND RESEARCH HOSPITAL

Medical Oncology Specialist

2010 - 2014, Malatya/Turkey

DOĞANŞEHİR STATE HOSPITAL

Internal Medicine Specialist

EDUCATION
 

2014 - 2017, Malatya/Turkey

Inönü University Faculty of Medicine

Medical Oncology Subspecialty Training

2005 - 2010, Samsun/Turkey

Ondokuz Mayıs University Faculty of Medicine

Internal Medicine Residency

1998 - 2005, Kayseri/Turkey

Erciyes University Faculty of Medicine

Medical Doctor Education

2021 - Currently, İstanbul

ASSOCIATE PROFESSOR

ASSOCIATE PROFESSOR

2009 - 2012, İstanbul / Turkey

T.R. ISTANBUL SCIENCE UNIVERSITY EUROPEAN FLORENCE NIGHTINGALE HOSPITAL

Minor Specialization Training

2003 - 2008, İstanbul / Turkey

ŞİŞLİ HAMİDİYE ETFAL EDUCATION AND RESEARCH HOSPITAL

Assistant Physician

1990 - 1996, Ankara / Turkey

GAZİ UNIVERSITY FACULTY OF MEDICINE

Medical Doctor Training

Professor of Oncology and Hematology