666 Ann Dermatol Received April 16, 2013, Revised October 22, 2013, Accepted for publication November 1, 2013 *These authors equally contributed to this work. Corresponding author: Thilo Gambichler, Department of Dermatology, Venereology, and Allergology, Ruhr-University Bochum, Gudrunstrasse 56, D-44791 Bochum, Germany. Tel: 49-234-509-3458, Fax: 49-234-509-3445, E-mail: t.gambichler@klinikum-...