1. From the Institute of Clinical Chemistry and Pathobiochemistry (C.C., B.S., A.Z., M.K., B.W., H.W.S., D.N., K.B.), Klinikum rechts der Isar, Technische Universität München, Germany; the Department of Restorative Dentistry and Periodontology (K.C.H.), Ludwig-Maximilians-Universität München, Germany; and INSERM U-545 and Institut Pasteur de Lille (C.F., M.R.), Lille, France.