1. Department of Orofacial Pain and Dysfunction Faculty of Dentistry Academic Centre of Dentistry Amsterdam (ACTA) University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands
2. Marie Curie Palliative Care Research Department Division of Psychiatry University College London London UK
3. The Research Department of Primary Care and Population Health University College London London UK
4. Barnet Enfield and Haringey Mental Health Trust Liaison Psychiatry Team North Middlesex University Hospital London UK