1. University of Verona; Department of Public Health and Community Medicine, Section of Psychiatry; Policlinico "G.B.Rossi" Pzz.le L.A. Scuro, 10 Verona Italy 37134
2. Istituto di Ricovero e Cura a Carattere Scientifico, Centro San Giovanni di Dio, Fatebenefratelli; Psychiatric Unit; Brescia Italy
3. Azienda Sanitaria per i Servizi Sanitari ? Provincia Autonoma di Trento; Dipartimento di Salute Mentale; Via Degasperi, 79 Trento Italy 38123
4. Kyoto University Graduate School of Medicine / School of Public Health; Department of Health Promotion and Human Behavior; Yoshida Konoe-cho, Sakyo-ku, Kyoto Japan 606-8501
5. National Center of Neurology and Psychiatry; Department of Clinical Epidemiology; 4-1-1 Ogawa-higashi Kodaira Tokyo Tokyo Japan 187-8551
6. University of Oxford; Department of Psychiatry; Warneford Hospital Oxford UK OX3 7JX