1. Department of Plastic Surgery/Neurosurgery, Johns Hopkins University, Baltimore, MD
2. Clinic for Reconstructive Surgery, University Hospital, Zurich, Switzerland
3. Department of Plastic, Hand and Reconstructive Surgery, Barmherzige Brüder Hospital, Regensburg, Germany
4. Department of Plastic, Hand and Reconstructive Surgery, Medizinische Hochschule, Hannover, Germany