The IDEFICS cohort: design, characteristics and participation in the baseline survey.

Ahrens, W; Bammann, K; Siani, A; Buchecker, K; De Henauw, S; Iacoviello, Licia; Hebestreit, A; Krogh, V; Lissner, L; Mårild, S; Molnár, D; Moreno, La; Pitsiladis, Yp; Reisch, L; Tornaritis, M; Veidebaum, T; Pigeot, I; Idefics, Consortium