Study of How Adiposity in Pregnancy has an Effect on outcomeS (SHAPES): protocol for a prospective cohort study oleh Louise Hayes, Luke Vale, Dawn Teare, John Allotey, Nicola Heslehurst, Theophile Bigirumurame, Raya Vinogradov, Giang T Nguyen, Susan C Lennie, Victoria Murtha, Rebecca Tothill, Janine Smith