[1] Karolinska Inst, Dept Prosthet Dent, Fac Odontol, Huddinge Hosp, S-14104 Huddinge, Sweden
[2] Karolinska Inst, Dept Clin Res Ctr, Huddinge Hosp, S-14104 Huddinge, Sweden
[3] Karolinska Inst, Dept Toxicol, S-10401 Stockholm, Sweden
[4] Univ Gothenburg, Dept Periodontol, Gothenburg, Sweden