[1] Univ Antwerp, Dept Family Med & Populat Hlth, Doornstr 331, B-2610 Antwerp, Belgium
[2] Univ Antwerp, Vaccine & Infect Dis Inst, Lab Med Microbiol, Antwerp, Belgium
[3] Univ Oxford, Nuffield Dept Primary Care Hlth Sci, Oxford, England
[4] Univ Crete, Fac Med, Clin Social & Family Med, Iraklion, Greece
[5] Rostock Univ, Inst Gen Practice, Med Ctr, Rostock, Germany
[6] Med Univ Bialystok, Dept Family Med, Bialystok, Poland
[7] Natl Univ Ireland, Sch Med, Galway, Ireland
[8] European Ctr Dis Prevent & Control ECDC, Solna, Sweden
[9] Med Univ Bialystok, Dept Obstet Gynaecol & Matern Care, Bialystok, Poland
[10] Univ Gothenburg, Inst Med, Sahlgrenska Acad, Sch Publ Hlth & Community Med, Gothenburg, Sweden
[11] Reg Vastra Gotaland, Res Dev Educ & Innovat, Primary Hlth Care, Gothenburg, Sweden
[12] Univ Coll Dublin, Sch Publ Hlth Physiotherapy & Sports Sci, Dublin, Ireland
[13] Antwerp Univ Hosp, Lab Clin Microbiol, Edegem, Belgium
[14] Univ Oxford Partnership Publ Hlth England, NIHR Hlth Protect Res Unit Healthcare Associated I, Oxford, Oxfordshire, England
[15] Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Primary Care, Utrecht, Netherlands