1. Department of Dermatology; University of Texas Southwestern-Austin; Austin TX U.S.A
2. Georgetown University School of Medicine; Washington DC U.S.A
3. The Brody School of Medicine at East Carolina University; Greenville NC U.S.A
4. Kansas City University of Medicine and Biosciences; Kansas City MO U.S.A
5. Department of Dermatology; University of Texas Southwestern Medical Center; 5323 Harry Hines Boulevard Dallas TX 75390-9190 U.S.A