1. University Center of Psychiatry, University Medical Center Groningen; University of Groningen; Groningen the Netherlands
2. PsyQ Eating Disorders; Lentis Psychiatric Institute; Groningen the Netherlands
3. Amarum Center for Eating Disorders; GGNet Mental Health Care; Zutphen the Netherlands
4. Department of General Practice; University Medical Center Groningen, University of Groningen; Groningen the Netherlands
5. Windesheim University of Applied Sciences; Zwolle the Netherlands
6. Parnassia Psychiatric Institute; The Hague the Netherlands
7. Department of Epidemiology, Mailman School of Public Health; Columbia University; New York NY USA