[1] Spaarne Gasthuis, Dept Internal Med, Hoofddorp, Netherlands
[2] Spaarne Gasthuis, Dept Sci, Haarlem, Netherlands
[3] Spaarne Gasthuis, Dept Sci, Hoofddorp, Netherlands
[4] Katholieke Univ Leuven, Ctr Environm & Hlth, Leuven, Belgium
[5] IDEWE, External Serv Prevent & Protect Work, Leuven, Belgium
[6] Med Univ Silesiaia, Sch Medinie Kotawice, Dept Epidemiol, Katowice, Poland
[7] Univ Palermo, Dept Hlth Promot Mother & Child Care, Internal Med & Med Specialties, Palermo, Italy
[8] Katholieke Univ Leuven, Leuven Child & Hlth Inst, Leuven, Belgium
[9] Katholieke Univ Leuven, Dept Dev & Regenerat, Leuven, Belgium
[10] Spaarne Gasthuis, POB 417, NL-2000 AK Haarlem, Netherlands