[1] Univ Calif San Francisco, Sch Nursing, Dept Social & Behav Sci, San Francisco, CA 94143 USA
[2] Univ Texas Austin, Sch Social Work, Austin, TX 78712 USA
[3] Univ Penn, Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[4] Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA
[5] Seattle Childrens Hosp, Canc & Blood Disorders Ctr, Seattle, WA USA
[6] Univ Washington, Sch Med, Dept Pediat, Seattle, WA 98195 USA