Developing a complex intervention for diet and activity behaviour change in obese pregnant women (the UPBEAT trial): assessment of behavioural change and process evaluation in a pilot randomised controlled trial

Lucilla Poston, Annette L. Briley, Suzanne Barr, Ruth Bell, Helen Croker, Kirstie Coxon, Holly N. Essex, Claire Hunt, Louise Hayes, Louise M. Howard, Nina Khazaezadeh, Tarja Kinnunen, Scott M. Nelson, Eugene Oteng-Ntim, Stephen C. Robson, Naveed Sattar, Paul T. Seed, Jane Wardle, Thomas A.B. Sanders, Jane Sandall