1. Stanford Sleep Epidemiology Research Center; Stanford University School of Medicine; Palo Alto; CA
2. Department of Psychiatry; University of Pittsburgh School of Medicine; Pittsburgh; PA
3. National Reference Center for Rare Diseases-Narcolepsy and Idiopathic Hypersomnia; Neurology Service; Gui-de-Chauliac Hospital; Institute of Health and Medical Research; Montpellier; France