[1] Harvard Univ, Sch Med, Brigham & Womens Hosp, Div Sleep Med, Boston, MA 02115 USA
[2] Med Coll Georgia, Augusta, GA 30912 USA
[3] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[4] Univ Texas, SW Med Ctr, Dallas, TX 75230 USA
[5] Boehringer Ingelheim KG, Div Med, D-6507 Ingelheim, Germany
[6] Boehringer Ingelheim KG, Clin Operat, Ridgefield, CT USA
[7] Boehringer Ingelheim Pharmaceut Inc, Clin Res CNS, Biberach, Germany