European lactase persistence genotype shows evidence of association with increase in body mass index. by Kettunen, J, Silander, K, Saarela, O, Amin, N, Müller, M, Timpson, N, Surakka, I, Ripatti, S, Laitinen, J, Hartikainen, A, Pouta, A, Lahermo, P, Anttila, V, Männistö, S, Jula, A, Virtamo, J, Salomaa, V, Lehtimäki, T, Raitakari, O, Gieger, C, Wichmann, E, Van Duijn, C, Smith, G, McCarthy, M, Järvelin, MR