1. Division of Dermatology Department of Medicine J.H. Stroger Hospital of Cook County 1900 West Polk Street Chicago IL 60612 U.S.A.
2. Department of Dermatology Rush Medical College Chicago IL U.S.A.
3. Countway Library of Medicine Harvard Medical School Boston MA U.S.A.
4. Department of Dermatology Zealand University Hospital Roskilde Denmark
5. Faculty of Health and Medical Sciences University of Copenhagen CopenhagenDenmark
6. Department of Dermatology Harvard Medical School and Beth Israel Deaconess Medical Center Boston MA U.S.A.