1. Department of Plastic Surgery, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
2. Bey Bergman Clinics, Hilversum, The Netherlands
There has been no financial support and there are no financial interests.
Address for correspondence: Prof. Dr. B. van der Lei, University Medical Center Groningen, PO box 30.001, 9700 RB Groningen, fax. (+31)(0)50-3613043, tel. (+31)(0)50-3613531.