[1] Univ Washington, Dept Biobehav Nursing & Hlth Informat, Box 357266, Seattle, WA 98195 USA
[2] Univ Washington, Dept Family & Child Nursing, Seattle, WA 98195 USA
[3] Univ Washington, Dept Psychiat & Behav Sci, Seattle, WA 98195 USA
[4] Univ Washington, Dept Psychosocial & Community Hlth, Seattle, WA 98195 USA