1. Blood Transfusion Department, Aretaieion Hospital, National and Kapodistrian Athens University Medical School, 11528 Athens, Greece
2. Coagulation Laboratory, Iatriko Kentro Hospital, 11525 Athens, Greece
3. 2nd Department of Obstetrics and Gynecology, Aretaieion Hospital, National and Kapodistrian Athens University Medical School, 11528 Athens, Greece