[1] Univ Parma, Sleep Disorders Ctr, Dept Neurol, I-43100 Parma, Italy
[2] Univ Hosp, Sleep Disorders Ctr, Dept Neurol, Ann Arbor, MI USA
[3] St Vincents Hosp & Med Ctr, Dept Neurol, New York, NY 10011 USA
[4] Stanford Univ, Med Ctr, Sleep Disorders Clin, Stanford, CA 94305 USA
[5] VAMC Sleep Ctr, Houston, TX USA
[6] Sleep Disorders Ctr, Minneapolis, MN USA
[7] Toronto Hosp, Ctr Sleep & Chronobiol, Toronto, ON M5T 2S8, Canada
[8] Laseeb ISR IST, Lisbon, Portugal
[9] Beth Israel Deaconess, Boston, MA USA
[10] JFK Med Ctr, New Jersey Neurosci Inst, Edison, NJ USA