1. Department of Interdisciplinary Ultrasound, University Hospital, Regensburg, Germany
2. Center of Plastic-, Hand- and Reconstructive Surgery, Caritas Hospital St. Josef, Regensburg, Germany
3. Institute of Biotechnology, Brandenburg University of Technology, Senftenberg, Germany
4. Center of Plastic-, Hand- and Reconstructive Surgery, University Hospital Regensburg, Regensburg, Germany