[1] Brigham & Womens Hosp, Div Sleep & Circadian Disorder, 75 Francis St, Boston, MA 02115 USA
[2] Massachusetts Gen Hosp, Ctr Genom Med, Boston, MA 02114 USA
[3] Univ Exeter, Sch Med, Genet Complex Traits, Exeter, Devon, England
[4] Univ Bristol, Integrat Epidemiol Unit, MRC, Bristol, Avon, England
[5] Univ Manchester, Fac Biol Med & Hlth, Sch Med Sci, Div Endocrinol Diabet & Gastroenterol, Manchester, Lancs, England