[1] Univ Lyon 1, CNRS, UMR 5558, Lab Biometry & Evolutionary Biol, F-69365 Lyon, France
[2] Univ Hosp, Intens Care Units, Lyon, France
[3] Univ Hosp, Infect Control Units, Lyon, France
[4] Univ Hosp, Hosp Civils Lyon, Edouard Herriot Hosp, Dept Epidemiol Hyg & Prevent, Lyon, France
[5] Univ Lausanne, Univ Hosp Ctr Vaud, Inst Social & Prevent Med, Hlth Care Evaluat Unit, CH-1005 Lausanne, Switzerland
[6] Geneva Univ Hosp & Med Sch, Infect Control Program, Geneva, Switzerland
[7] Ctr Infect Dis, Dept Social & Prevent Med, Publ Hlth Unit, Montreal, PQ, Canada