1. Facial Nerve Center, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston
2. Department of Plastic Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
3. Department of Economics, Econometrics and Finance, University of Groningen, Groningen, the Netherlands
4. Department of Plastic and Reconstructive Surgery, Royal Australasian College of Surgeons, University of Sydney, Sydney, Australia
5. Department of Rehabilitation Medicine, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
6. Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands