1. Department of Dermatology University of California, Davis Sacramento CA U.S.A.
2. University of California, Davis School of Medicine Sacramento CA U.S.A.
3. Departments of Pediatrics and Dermatology University of California, San Diego School of Medicine San Diego CA U.S.A.
4. Pediatric and Adolescent Dermatology Rady Children's Hospital San Diego CA U.S.A.