1. University of Miami Miller School of Medicine; Department of Dermatology and Cutaneous Surgery; University of Miami Hospital 1295 N.W. 14th St. Miami Florida USA 33136
2. Veterans' Affairs Northern California Health Care System; Department of Surgery; 10535 Hospital Way Mather California USA 95655
3. University of Pennsylvania; Center for Clinical Epidemiology and Biostatistics; 901 Blockley Hall 423 Guardian Drive Philadelphia USA PA19104
4. UC Davis; Department of Dermatology; 3301 C Street Suite 1400 Sacramento California USA 95816