[1] Univ Kansas, Sch Med, Kansas City, KS USA
[2] Copenhagen Univ Hosp, Ctr Adolescent Med, Dept Pediat & Adolescent Med, Rigshosp, Copenhagen, Denmark
[3] Copenhagen Univ Hosp, Univ Hosp Ctr Hlth Res UCSF, Rigshosp, Copenhagen, Denmark
[4] Univ Copenhagen, Inst Publ Hlth, Copenhagen, Denmark
[5] Copenhagen Univ Hosp, Rigshosp, Dept Pediat & Adolescent Med, DK-2100 Copenhagen, Denmark