1. Department of Dermatology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia PA U.S.A.
2. Corporal Michael J. Crescenz Veterans Affairs Medical Center; Philadelphia PA U.S.A.
3. Center for Clinical Epidemiology and Biostatistics; University of Pennsylvania; Philadelphia PA U.S.A.
4. Hackensack University Medical Center; Hackensack NJ U.S.A.
5. Division of Neurology; Children's Hospital of Philadelphia; Philadelphia PA U.S.A.
6. Division of Dermatology; Washington University School of Medicine; St Louis MO U.S.A.
7. Division of Rheumatology; Children's Hospital of Philadelphia; Philadelphia PA U.S.A.
8. St Christopher's Hospital for Children; Philadelphia PA U.S.A.
9. Division of Dermatology; Children's Hospital of Philadelphia; Philadelphia PA U.S.A.
10. Environmental Autoimmunity Group. Clinical Research Branch; National Institute of Environmental Health Sciences; National Institutes of Health; Bethesda MD U.S.A.
11. Penn State Children's Hospital; Hershey PA U.S.A.
12. Brenner Children's Hospital; Wake Forest Baptist Medical Center; Winston-Salem NC U.S.A.
13. Minneapolis Clinic of Neurology; Maple Grove MN U.S.A.