1. Facial Nerve Center, Department of Otolaryngology/Head and Neck Surgery Massachusetts Eye and Ear Infirmary and Harvard Medical School Boston Massachusetts
2. Department of Plastic surgery University Medical Center Groningen, University of Groningen Groningen The Netherlands
3. Department of Rehabilitation Medicine, Department of Oral and Maxillofacial Surgery University Medical Center Groningen, University of Groningen Groningen The Netherlands