Christian K Spies1, Frank Unglaub2,3. 1. Department of Hand Surgery, Vulpius Klinik, Bad Rappenau, Germany. christianspies27@gmail.com. 2. Department of Hand Surgery, Vulpius Klinik, Bad Rappenau, Germany. 3. Medical Faculty Mannheim, Ruprecht-Karls-University Heidelberg, Mannheim, Germany.