Caesarean section is associated with an increased risk of childhood-onset type 1 diabetes mellitus: a meta-analysis of observational studies - Cardwell, C R; Stene, L C; Joner, G; Cinek, O; Svensson, J; Goldacre, M J; Parslow, R C; Pozzilli, P; Brigis, G; Stoyanov, D; Urbonaite, B; Sipetic, S; Schober, E; Ionescu-Tirgoviste, C; Devoti, G; de Beaufort, C E; Buschard, K; Patterson, C C (Diabetologia, 2008)