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Chappell, Lucy C and Seed, Paul T and Myers, Jenny and Taylor, Rennae S and Kenny, Louise C and Dekker, Gustaaf A and Walker, James J and McCowan, Lesley ME and North, Robyn A and Poston, Lucilla (2013) Exploration and confirmation of factors associated with uncomplicated pregnancy in nulliparous women: prospective cohort study. BMJ , 347 , f6398.