[1] Univ Washington, Dept Pediat, Seattle, WA 98195 USA
[2] Minneapolis Med Res Fdn Inc, Sci Registry Transplant Recipients, Minneapolis, MN USA
[3] St Louis Univ, Sch Med, Dept Surg, St Louis, MO USA
[4] Univ Minnesota, Dept Epidemiol & Community Hlth, Minneapolis, MN USA
[5] Univ Minnesota, Hennepin Cty Med Ctr, Dept Med, Minneapolis, MN 55415 USA