[1] Johns Hopkins Univ, Sch Nursing, 525 N Wolfe St,N307, Baltimore, MD 21205 USA
[2] Kaiser Permanente Washington Hlth Res Inst, Invest Sci Div, Seattle, WA USA
[3] Univ Washington, Dept Stat, Seattle, WA USA
[4] Univ Washington, Dept Child Family & Populat Hlth Nursing, Seattle, WA USA
[5] Univ Washington, Dept Hlth Syst & Populat Hlth, Seattle, WA USA
[6] Univ Washington, Dept Epidemiol, Seattle, WA USA
[7] Univ Washington, Ctr Studies Demog & Ecol, Seattle, WA USA
[8] Univ Washington, Dept Urban Design & Planning, Urban Form Lab, Seattle, WA USA
[9] Univ Washington, Dept Biobehav Nursing & Hlth Informat, Seattle, WA USA