1. Department of Dermatology and Allergology and EB House Austria, University Hospital of the Paracelsus Medical University, Salzburg, Austria
2. Department of Dermatology, UMCG Center of Expertise for Blistering Diseases, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
3. Central Medical Library, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands