[1] Med Univ Innsbruck, Div Hyg & Med Microbiol, Innsbruck, Austria
[2] Univ Otago, Sch Pharm, Dunedin, New Zealand
[3] Univ Otago, Sir John Walsh Res Inst, Dunedin, New Zealand
[4] Univ Otago, New Zealands Natl Ctr Dent, Dept Oral Sci, Dunedin, New Zealand