[1] Rhein Westfal TH Aachen, Univ Hosp Aachen, Dept Infect Control & Infect Dis, D-52074 Aachen, Germany
[2] Rhein Westfal TH Aachen, Univ Hosp Aachen, Dept Hyg & Environm Med, D-52074 Aachen, Germany
[3] Univ Hosp Dusseldorf, Dept Med Microbiol & Infect Control, Dusseldorf, Germany