1. Clinic of Plastic and Reconstructive Surgery, Handsurgery, Burn Care Center; University of Witten/Herdecke, Cologne-Merheim Medical Center; Cologne Germany
2. Institute for Research in Operative Medicine; University of Witten/Herdecke; Cologne Germany
3. Department of Trauma, Hand and Reconstructive Surgery; Hospital of the Johann Wolfgang Goethe-University; Frankfurt Germany
4. Department of Handsurgery, Plastic and Aesthetic Surgery; Ludwig-Maximilians-University; Munich Germany