Institution: | 1. Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, Athens, Greece;2. Department of Gastroenterology, Medical School, National and Kapodistrian University of Athens, Laiko General Hospital, Athens, Greece;3. Faculty of Social and Political Sciences, University of Peloponnese, Korinthos, Greece;4. Center for Disease Analysis, Lafayette, Colorado, USA |