[1] Univ Childrens Hosp, Munich, Germany
[2] Univ Marburg, Dept Clin Chem & Mol Diagnost, Marburg, Germany
[3] Univ Ulm, Inst Epidemiol, Ulm, Germany
[4] HelmholtzZentrum Munchen German Res Ctr Environm, Munich, Germany
[5] Univ Zurich, Childrens Hosp, Zurich, Switzerland
[6] Natl Publ Hlth Inst, Dept Environm Hlth, Kuopio, Finland
[7] Univ Franche Comte, SERF Res Unit, F-25030 Besancon, France
[8] Childrens Hosp, Schwarzach, Austria
[9] Univ Med Ctr Utrecht, Inst Risk Assessment Sci, Utrecht, Netherlands
[10] Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Primary Care, Utrecht, Netherlands
[11] Univ Hosp, Dept Resp Dis, Besancon, France
[12] Univ Basel, Inst Social & Prevent Med, Basel, Switzerland
[13] Univ Kuopio, Sch Publ Hlth & Clin Nutr, FIN-70211 Kuopio, Finland