1. Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
2. Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece2Program Medical Neurosciences, Charité-Universitätsmedizin, Berlin, Germany
3. Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden
4. Division of Internal Medicine, Department of Medicine, Faculty of Medicine, McGill University, Montreal, Quebec, Canada