[1] Vanderbilt Univ, Sch Med, Auton Dysfunct Ctr, Dept Med,Div Clin Pharmacol, Nashville, TN 37212 USA
[2] Vanderbilt Univ, Sch Med, Dept Neurol, Nashville, TN 37212 USA
[3] Vanderbilt Univ, Sch Med, Vanderbilt Sleep Disorders Ctr, Nashville, TN 37212 USA
[4] Repatriat Gen Hosp, Adelaide Inst Sleep Hlth, Daw Pk, SA, Australia
[5] Natl Hosp Neurol & Neurosurg, Auton Unit, London WC1N 3BG, England
[6] St Marys Hosp, Imperial Coll London, Fac Med, Neurovasc Med Unit, London, England
[7] Vanderbilt Univ, Sch Med, Ctr Mol Neurosci, Nashville, TN 37212 USA
[8] Rush Univ, Med Ctr, Dept Pediat, Chicago, IL 60612 USA
[9] Rush Univ, Med Ctr, Dept Neurol & Biochem, Chicago, IL 60612 USA