[1] Univ Complutense Madrid, Fac Odontol, Dept Periodontol, E-28040 Madrid, Spain
[2] UCL, Eastman Dent Inst, Periodontol Unit, London, England
[3] UCL, Great Olmond St Hosp, Cardiothorac Unit, London, England
[4] Univ Complutense Madrid, Dept Cardiol, Hosp Gregorio Maranon, E-28040 Madrid, Spain