1. Department of Periodontology; Service of Odontology; Rothschild Hospital; AP-HP, Paris 7-Denis Diderot University, U.F.R. of Odontology; Paris France
2. EA 2496; Paris 5-Descartes University, U.F.R. of Odontology; Paris France
3. INSERM, U1018; Villejuif France