1. Department of Plastic Surgery, University of Helsinki and Helsinki University Hospital, Töölön Sairaala, P.O. Box 266, 00029 Helsinki, Finland
2. Department of Surgery, Central Finland Central Hospital, Jyväskylä, Finland
3. Department of Plastic Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
4. Department of Orthopedics and Traumatology, Tampere University Hospital, Tampere, Finland