[1] Univ Texas Austin, Sch Nursing, Sichuan Univ, Sleep Med Ctr,West China Hosp, Austin, TX 78712 USA
[2] Thomas Jefferson Univ, Dept Family & Community Med, Philadelphia, PA USA
[3] Univ Penn, Sch Med, Div Sleep Med, Ctr Sleep & Circadian Neurobiol, Philadelphia, PA 19104 USA
[4] Univ Texas Austin, Sch Nursing, Austin, TX 78712 USA