1. Department of Dental Materials Science; Academic Centre for Dentistry Amsterdam, University of Amsterdam & VU University Amsterdam; Gustav Mahlerlaan 3004 1081 LA Amsterdam The Netherlands
2. Department of Pathology; VU University Medical Centre; De Boelelaan 1117 1081 HV Amsterdam The Netherlands
3. Department of Dermatology; VU University Medical Centre; De Boelelaan 1117 1081 HV Amsterdam The Netherlands