[1] Univ Minnesota, Sch Publ Hlth, Dept Lab Med & Pathol, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Sch Publ Hlth, Div Biostat, Minneapolis, MN 55455 USA
[3] Univ Washington, Dept Biostat, Seattle, WA 98195 USA
[4] Hlth Diagnost Lab Inc, Richmond, VA USA
[5] NHLBI, NIH, Mol Dis Branch, Bethesda, MD 20892 USA