1. Departments of Dermatology and Pediatrics and
2. Departments of Dermatology and Pediatrics, Columbia University, New York, New York;
3. Department of Dermatology, Hospital de la Santa Creu I Sant Pau, Barcelona, Spain;
4. Departments of Pediatrics and Dermatology, Feinberg School of Medicine, Northwestern University, Evanston, Illinois;
5. Department of Dermatology, University of California, San Francisco, California;
6. Department of Dermatology, Medical College of Wisconsin, Milwaukee, Wisonsin;
7. Kaiser Permanente, San Francisco, California;
8. Division of Dermatology, Department of Pediatrics, CHU Sainte-Justine, University of Montreal, Montreal, Québec, Canada;
9. Department of Dermatology, Baylor College of Medicine, Houston, Texas; and
10. Department of Medicine, Division of Biostatistics, Indiana University, Indianapolis, Indiana;
11. Department of Dermatology, Oregon Health and Science University, Portland, Oregon