1. Centre of Plastic, Aesthetic, Hand and Reconstructive Surgery, University of Regensburg, Regensburg, Germany
2. Division of Hand, Plastic and Aesthetic Surgery, University Hospital, LMU Munich, Germany
3. Department of Plastic and Esthetic Surgery, Hand Surgery, Helios Hospital Emil von Behring, Berlin, Germany
4. Department of Plastic, Reconstructive, Esthetic and Handsurgery, ETHIANUM Klinik Heidelberg, Heidelberg, Germany
5. Center for Clinical Studies, University Medical Center Regensburg, Regensburg, Germany
6. Department of Plastic, Reconstructive, Hand and Burn Surgery, Bogenhausen Academic Teaching Hospital, Munich, Germany