1. Dermatologic Surgery Unit, Department of Dermatology, Venereology & Allergology, Ruhr-University Bochum, 44791 Bochum, Germany
2. Department of Plastic Surgery, St. Josef Hospital, Catholic Clinics of the Ruhr Peninsula, 45257 Essen, Germany
3. University of Michigan Kellogg Eye Center, Ann Arbor, MI 48105, USA
4. Department of Internal Medicine, Knappschaftskrankenhaus University of Bochum, Zentrum für Klinische Forschung, Labor für Molekulare Gastroenterologische Onkologie, 44780 Bochum, Germany