[1] Clin Paediat Pulmonol Allergol & Neonatol, Hannover, Germany
[2] Univ Hosp Munster, Inst Biostat & Clin Res, Munster, Germany
[3] Erasmus MC, Dept Med Microbiol & Infect Dis, Rotterdam, Netherlands
[4] Tech Univ Dresden, Inst Med Informat & Biometr, Dresden, Germany
[5] Hannover Med Sch, Clin Paediat Pulmonol Allergol & Neonatol, Clin Res Grp, Hannover, Germany
[6] Med Univ Innsbruck, Dept Child & Adolescent Hlth, CF Ctr Innsbruck, Innsbruck, Austria
[7] Univ Hosp Munster, Dept Paediat, Munster, Germany
[8] Clemenshosp Munster, Dept Paediat, Munster, Germany
[9] Ruhr Univ, Paediat Clin, St Josef Hosp, Bochum, Germany
[10] Univ Hosp Essen, Dept Paediat, Essen, Germany
[11] Kinderarztl Ambulanz, Hamburg, Germany
[12] Jena Univ Hosp, Dept Paediat, CF Ctr, Jena, Germany
[13] Univ Clin Dresden, Dept Paediat, Dresden, Germany
[14] Univ Clin Tubingen, Dept Pediat, Tubingen, Germany
[15] Charite Univ Med Berlin, Dept Paediat Pulmonol & Immunol, Campus Virchow Klinikum, Berlin, Germany
[16] Univ Hosp Halle, Halle, Germany
[17] Childrens Hosp Osnabruck, Osnabruck, Germany
[18] Univ Dusseldorf, Dept Paediat, Dusseldorf, Germany
[19] Pk Schonefeld Clin, Kassel, Germany
[20] Ruhrlandklin, Essen, Germany
[21] Univ Clin Leipzig, Leipzig, Germany
[22] Univ Hosp Munster, Ctr Lab Med, Munster, Germany
[23] Univ Hosp Munster, Inst Med Microbiol, Munster, Germany