1. Department of Operative Dentistry and Periodontology, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
2. Institute of Network Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
3. Clinic for Conservative and Preventive Dentistry, Center of Dental Medicine, University of Zürich, Zürich, Switzerland
4. Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center—University of Freiburg, Freiburg, Germany