[1] Univ Paris 07, Hop Hotel Dieu, AP HP, Serv Odontol,Dept Periodontol,UFR Odontol, F-75221 Paris 05, France
[2] Univ Lyon 1, Lab Anal Hlth Syst, UMR 5823, CNRS,Publ Hlth Dept, F-69365 Lyon, France
[3] Univ Paris 07, Hop Hotel Dieu, AP HP, Serv Odontol,UFR Odontol,Dept Prosthet Dent, F-75221 Paris 05, France
[4] Paris Descartes Univ, LIRAES, Lab Interdisciplinaire Rech Appl Econ Sante, Paris, France
[5] Data Min Int, Geneva, Switzerland