1. Department of Operative Dentistry and Periodontology; University Hospital; Ludwig-Maximilians-Universität München; Munich Germany
2. Institute of Epidemiology I; Helmholtz Zentrum Munich; German Research Centre for Environmental Health, Neuherberg; Munich Germany
3. Dr. von Hauner Children's Hospital; Division of Metabolic Diseases and Nutritional Medicine; Ludwig-Maximilians-Universität München; Munich Germany
4. Institute for Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics; University Hospital of Leipzig; Leipzig Germany
5. Unit of Periodontology; School of Dentistry; University Medicine Greifswald; Greifswald Germany
6. Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine; University Hospital of Munich; Ludwig-Maximilians-Universität München; Munich Germany