[1] CNR, Inst Food Sci, Epidemiol & Populat Genet, I-83100 Avellino, Italy
[2] Leibniz Inst Prevent Res & Epidemiol BIPS, Bremen, Germany
[3] Univ Bremen, Inst Publ Hlth & Nursing Res, D-28359 Bremen, Germany
[4] Res & Educ Inst Child Hlth, Strovolos, Cyprus
[5] Univ Gothenburg, Sahlgrenska Acad, Dept Paediat, Gothenburg, Sweden
[6] Univ Pecs, Dept Paediat, Pecs, Hungary
[7] Natl Inst Hlth Dev, Dept Chron Dis, Tallinn, Estonia
[8] Univ Ghent, Dept Publ Hlth, B-9000 Ghent, Belgium
[9] Univ Bremen, Fac Math & Comp Sci, Inst Stat, D-28359 Bremen, Germany
[10] Univ Zaragoza, GENUD Res Grp, Zaragoza, Spain