[1] Univ Antwerp, Dept Pulm Med, B-2610 Antwerp, Belgium
[2] Univ Hosp Antwerp, B-2610 Antwerp, Belgium
[3] Univ Hosp, Lab Med, B-3000 Leuven, Belgium
[4] Univ Hosp, Geriatr Med, B-3000 Leuven, Belgium
[5] Univ Hosp, Internal Med, B-3000 Leuven, Belgium
[6] Univ Antwerp, Vaccine & Infect Dis Inst, B-2610 Antwerp, Belgium
[7] UCL Mt Godinne, Infect Dis, B-5530 Yvoir, Belgium
[8] St Pierre Univ Hosp, Infect Dis, B-1000 Brussels, Belgium
[9] Pfizer Specialty Care, Dept Med, B-1050 Brussels, Belgium