National Cancer Institute at Frederick - Human Retrovirus Section, National and Kapodistrian University of Athens - Department of Clinical Therapeutics, - Department of Clinical Therapeutics, National Cancer Institute at Frederick - Human Retrovirus Pathogenesis Section, National Cancer Institute at Frederick - Human Retrovirus Pathogenesis Section, National Cancer Institute at Frederick - Human Retrovirus Pathogenesis Section, National Cancer Institute at Frederick - Human Retrovirus Pathogenesis Section, - Department of Clinical Therapeutics, Frederick National Laboratory for Cancer Research - MS Applied Information and Management Sciences, National Cancer Institute - Biostatistics and Data Management Section, National and Kapodistrian University of Athens Medical School - Hematology and Oncology Unit, National Cancer Institute at Frederick - Human Retrovirus Section and National Cancer Institute at Frederick - Human Retrovirus Pathogenesis Section

- First Neurology Department, - First Neurology Department, Rigshospitalet Glostrup - Danish Headache Centre, - First Department of Propaedeutic and Internal Medicine, - Department of Clinical Therapeutics, - First Department of Propaedeutic and Internal Medicine, - Department of Clinical Therapeutics, - Second Department of Neurology, ASTAT Statistics in Clinical Research, - 2nd Department of Surgery, - Second Department of Neurology, National and Kapodistrian University of Athens Medical School - Hematology and Oncology Unit, University of Turin - Department of Psychology and - First Department of Propaedeutic and Internal Medicine