Pre-school obesity is associated with an increased risk of childhood fracture: a longitudinal cohort study of 466 997 children and up to 11 years of follow up in Catalonia, Spain by Lane, J, Butler, K, Poveda-Marina, JL, Martinez-Laguna, D, Reyes, C, de Bont, J, Javaid, MK, Logue, J, Cooper, C, Duarte-Salles, T, Furniss, D, Prieto-Alhambra, D