Michael V Vitiello1, Jean Krieger2. 1. Psychiatry and Behavioural Sciences, University of Washington, P.O. Box 356560, Seattle, WA 98195-6560, USA. Electronic address: vitiello@u.washington.edu. 2. Faculté de Médecine, Université Louis Pasteur, Rue Kirschleger, F-67000 Strasbourg, France. Electronic address: krieger.jean@laposte.net.