1. Department of DermatologyUniversity of PennsylvaniaPerelman Center for Advanced Medicine Suite 1‐330A, 3400 Civic Center Boulevard Philadelphia PA 19104 U.S.A.
2. Corporal Michael J. Crescenz VA Medical Center Philadelphia PA U.S.A.
3. Department of Biostatistics, Epidemiology and InformaticsUniversity of Pennsylvania Philadelphia PA U.S.A.
4. Department of Pediatrics and Medical Social SciencesNorthwestern University Feinberg School of Medicine Chicago IL U.S.A.
5. Department of Pediatrics and DermatologyUniversity of Washington School of Medicine Seattle WA U.S.A.
6. Section of DermatologyDepartment of PediatricsChildren's Hospital of Philadelphia Philadelphia PA U.S.A.
7. Division of RheumatologyDepartment of PediatricsChildren's Hospital of Philadelphia Philadelphia PA U.S.A.
8. Departments of Dermatology and PediatricsMedical College of Wisconsin Milwaukee WI U.S.A.
9. Departments of Dermatology and PediatricsBaylor College of Medicine Houston TX U.S.A.
10. Department of PediatricsDivision of RheumatologyNYU Langone Medical Center New York NY U.S.A.
11. Departments of Dermatology and PediatricsUniversity of Wisconsin School of Medicine Madison WI U.S.A.