1. Department of Dermatology; VU University Medical Centre; Amsterdam The Netherlands
2. Department of Oral Cell Biology, Academic Centre for Dentistry Amsterdam; University of Amsterdam and Vrije Universiteit Amsterdam; Amsterdam The Netherlands
3. Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam; University of Amsterdam and Vrije Universiteit; Amsterdam The Netherlands
4. Unit Medical Immunology, Department of Clinical Chemistry; VU University Medical Centre; Amsterdam The Netherlands