[1] Hennepin Healthcare Res Inst, Sci Registry Transplant Recipients, Minneapolis, MN 55404 USA
[2] Univ Minnesota, Dept Epidemiol & Community Hlth, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Dept Med, Hennepin Healthcare, Box 736 UMHC, Minneapolis, MN 55455 USA
[4] United Network Organ Sharing, Organ Procurement & Transplantat Network, Richmond, VA USA