1. Department of Cariology, Endodontology and Periodontology; University of Leipzig; Leipzig Germany
2. Department of Preventive Dentistry, Periodontology and Cariology; University Medical Centre Goettingen; Goettingen Germany
3. Clinic for Rheumatology; Bad Wildungen Germany
4. Department of Nephrology and Rheumatology; University Medical Centre Goettingen; Goettingen Germany
5. Clinical Research Organisation; Hamm Germany