[1] Univ Vita Salute San Raffaele, San Raffaele Sci Inst, Div Neurosci, Sleep Disorders Ctr, Milan, Italy
[2] Oasi Res Inst IRCCS, Sleep Res Ctr, Troina, Italy
[3] IRCCS Mondino Fdn, Unit Sleep Med & Epilepsy, Pavia, Italy
[4] Univ Calif San Francisco Fresno, Fresno, CA USA
[5] Univ Minnesota, Med Sch, Dept Psychiat, Hennepin Cty Med Ctr, Minneapolis, MN 55455 USA