[1] Sleep Res Inst, Madrid 28036, Spain
[2] Res Pharmaceut Serv Inc, Ft Washington, PA USA
[3] Univ Erlangen Nurnberg, Dept Psychol, Nurnberg, Germany
[4] Mayo Clin, Coll Med, Rochester, MN USA
[5] Mayo Clin, Ctr Sleep Med, Rochester, MN USA
[6] Mayo Clin, Dept Neurol, Rochester, MN USA
[7] Harvard Univ, Sch Med, Boston, MA USA
[8] Brigham & Womens Hosp, Dept Med, Div Sleep Med, Boston, MA 02115 USA
[9] Johns Hopkins Univ, Dept Neurol, Baltimore, MD 21218 USA
[10] Johns Hopkins Bayview Med Ctr, Sleep Disorders Ctr, Baltimore, MD USA
[11] Med Univ Innsbruck, Dept Neurol, A-6020 Innsbruck, Austria
[12] Civ Hosp, Neuroctr Southern Switzerland, Sleep & Epilepsy Ctr, Lugano, Switzerland
[13] Univ Montreal, Dept Psychiat, Montreal, PQ H3C 3J7, Canada
[14] Univ Montreal, Dept Neurosci, Montreal, PQ, Canada
[15] Neuropsychiat Res Inst, Japan Somnol Ctr, Tokyo, Japan
[16] Tokyo Med Univ, Dept Somnol, Tokyo 1608402, Japan