1. Department of Pediatrics, Oregon Health and Science University, OHSU-Portland State School of Public Health, Portland, OR;
2. Department of Pediatrics, Oregon Health and Science University, Portland, OR;
3. Center for Dermatology and Laser Surgery, Portland, OR;
4. Harvard School of Public Health, Boston, MA;
5. Division of General Pediatrics, Department of Pediatrics, Stanford School of Medicine, Stanford, CA.