1. Department of Dermatology and Allergy, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
2. Department of Plastic Surgery, Aalborg University Hospital, Aalborg, Denmark
3. Gastro-unit, Hvidovre Hospital, University of Copenhagen, Hidovre, Denmark
4. Department of Dermatology, Dermatology Research and Education Foundation, Irvine, CA, USA