Dr. John is an Associate Professor at the University of Crete. He served as a supernumerary Doctor of the University Hospital of Heraklion. As such, he was placed in the Department of Medical Oncology of the hospital where the conduction of the cooperative international studies of the department was assigned to him. This was his first contact with the object of clinical research.
His specialization was in Medical Oncology, first as a resident in Hematology for 6 months and afterward as a resident in Medical Oncology.
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