[1] Univ Sheffield, Sch Clin Dent, Unit Oral & Maxillofacial Med Surg & Pathol, Sheffield, S Yorkshire, England
[2] Carolinas Med Ctr, Dept Oral Med, Charlotte, NC 28203 USA
[3] Taunton & Somerset NHS Trust, Dept Cardiol, Taunton, Somerset, England
[4] Washington Univ, Sch Med, Div Infect Dis, St Louis, MO 63110 USA
[5] Mayo Clin, Dept Med, Div Infect Dis, Coll Med, Rochester, MN USA
[6] Mayo Clin, Dept Cardiovasc Med, Coll Med, Rochester, MN USA