[1] Univ Washington, Dept Med, Div Med Genet, Seattle, WA 98195 USA
[2] Univ Ottawa, Dept Epidemiol & Community Med, Ottawa, ON, Canada
[3] Univ Washington, Dept Genome Sci, Seattle, WA 98195 USA
[4] Univ Washington, Dept Med, Div Endocrinol & Metab, Seattle, WA USA
[5] Univ Washington, Dept Biostat, Seattle, WA 98195 USA