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.