1. Nursing and Health Studies Program, University of Washington Bothell, Bothell, Washington 98011;
2. Child Health Evaluation and Research Unit, Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, Michigan 48109;
3. Treuman Katz Center for Pediatric Bioethics, Seattle Children's Research Institute, Seattle, Washington 98101;
4. Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington 98101