Genetic Basis for Gestation Length Por Pennell, C, Warrington, N, Mook-Kanamori, D, Lye, S, Newnham, J, Palmer, L, Jaddoe, V, Freathy, R, Jacobssen, B, Holloway, J, McCarthy, M, Frayling, T, Consortium, PGP, Consortium, EGG