1. Department of Pediatrics, Children's Hospital and Regional Medical Center, and
2. Department of Medicine (Dermatology), University of Washington School of Medicine, Seattle, Washington;
3. Department of International Health, School of Hygiene and Public Health, Johns Hopkins Medical Institutions, Baltimore, Maryland;
4. Department of Dermatology, Stanford University School of Medicine, Stanford, California; and
5. Departments of Dermatology and Nutrition, University of California, Davis, California