1. Department of Orofacial Pain and Dysfunction Academic Centre for Dentistry Amsterdam (ACTA) University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands
2. Department of Oral & Maxillofacial Surgery and Maxillofacial Prosthetics Leiden University Medical Centre Leiden The Netherlands
3. CMD‐Centrum Hamburg‐Eppendorf Hamburg Germany
4. Department of Prosthetic Dentistry Centre for Dental and Oral Medicine University Medical Centre Hamburg‐Eppendorf (UKE) Hamburg Germany