Pragmatic cluster randomised cohort cross-over trial to determine the effectiveness of bridging from emergency to regular contraception: the Bridge-It study protocol by Anne Johnstone, Judith M Stephenson, Andrew Radley, Kaye Wellings, Paula Baraitser, Alison McDonald, James Trussell, Richard Gilson, Lisa Mcdaid, Sharon Tracey Cameron, Anna Glasier, Claire Battison, Sarah Cameron, Kathleen Cowle, Mark Forrest, Beatriz Goulao, Susan Patterson, Deirdre Sally, Nicola Stewart, Lucy Michie, Joanna Loudon, Kirsten Stuart, Emily Whittaker

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