[1] Balgrist Univ Hosp, Infectiol, Zurich, Switzerland
[2] Balgrist Univ Hosp, Orthopaed Dept, Zurich, Switzerland
[3] Univ Basel, Univ Hosp Basel, Dept Infect Dis & Hosp Epidemiol, Basel, Switzerland
[4] Univ Basel, Univ Hosp Basel, Dept Orthopaed & Traumatol, Basel, Switzerland
[5] Univ Washington, Seattle, WA 98195 USA
[6] Univ Oxford, Green Templeton Coll, Oxford, England