1. The Ronald O. Perelman Department of Dermatology, New York University School of Medicine, 522 First Avenue, New York, NY 10016, USA
2. Department of Dermatology, University Hospital Zurich, 8091 Zurich, Switzerland
3. Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
4. Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112, USA