1. Institute of Psychology, Health, Medical and Neuropsychology Unit; Leiden University; Leiden the Netherlands
2. Department of Medical Psychology; Radboud University Medical Center; Nijmegen the Netherlands
3. Department of Dermatology; Rijnstate Hospital; Velp the Netherlands
4. Department of Dermatology; Canisius-Wilhelmina Hospital; Nijmegen the Netherlands
5. Department of Dermatology; Ziekenhuisgroep Twente; Almelo the Netherlands
6. Department of Dermatology; Radboud University Medical Center; Nijmegen the Netherlands
7. Department for Health Evidence; Radboud University Medical Center; Nijmegen the Netherlands