1. Department of Dermatology, Mt. Zion Cancer Research Center, University of California San Francisco, San Francisco, CA, USA
2. Department of Dermatology, The Rudolfstiftung Hospital, Academic Teaching Hospital, Medical University Vienna, Vienna, Austria
3. School of Medicine, Sigmund Freud University, Vienna, Austria
4. Children's Cancer Research Institute, St. Anna Kinderspital, Vienna, Austria
5. Department of Medical Sciences, Section of Dermatology, University of Turin, Turin, Italy