1. Dermatology and Allergology, Feldafing, Germany.
2. Department of Dermatology and Allergology, Ludwig-Maximilian University, Munich, Germany.
3. Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilian University, Munich, Germany.
4. Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilian University, Munich, Germany.
5. Science-Consulting in Diabetes GmbH, Neuss, Germany.