1. Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
2. Current Affiliation: Department of Plastic and Hand Surgery, University Hospital of Regensburg, University of Regensburg, Regensburg, Germany
3. Department of Cardiac Surgery, University Hospital of Erlangen, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany