1. Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
2. Department of Oral Kinesiology, Academic Centre for Dentistry Amsterdam, MOVE Research Institute Amsterdam, University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands;
3. Department of Oral and Maxillofacial Surgery, Amsterdam UMC and Academic Centre for Dentistry Amsterdam, University of Amsterdam, Amsterdam, The Netherlands;
4. Department of Oral and Maxillofacial Surgery, Ziekenhuis Nij Smellinghe, Drachten, The Netherlands;
5. Department of Home Mechanical Ventilation, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
6. Department of Clinical Neurophysiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
7. Dr. Stegenga is deceased