1. Department of Surgery, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
2. Department of Dermatology, University Hospital Jena, Erfurter Str. 25, 07743 Jena, Germany
3. UMC St Radboud, Nijmegen & Andriessen Consultants, Malden, The Netherlands
4. Lohmann & Rauscher GmbH & Co. KG, Westerwaldstrasse 4, 56579 Rengsdorf, Germany
5. Lohmann & Rauscher GmbH & Co. KG, Irlicher Str. 55, 56567 Neuwied, Germany