[1] Duke Univ, Durham, NC USA
[2] Duke Univ, Sch Med, Dept Pediat, Durham, NC USA
[3] Univ Colorado, Sch Med, Dept Pediat, Aurora, CO USA
[4] Univ Washington, Dept Pediat, Div Bioeth & Palliat Care, Sch Med, Seattle, WA USA
[5] Seattle Childrens Res Inst, Treuman Katz Ctr, Ctr Clin & Translat Res, Seattle, WA USA
[6] Stanford Univ, Div Child Neurol, Palo Alto, CA 94304 USA
[7] Duke Global Hlth Inst, Durham, NC USA
[8] Duke Univ, Sch Med, Dept Populat Hlth Sci, Durham, NC USA