Effectiveness and cost-effectiveness randomised controlled trial of basic versus biofeedback-mediated intensive pelvic floor muscle training for female stress or mixed urinary incontinence : protocol for the OPAL ( optimising pelvic floor exercises to achieve long-term benefits ) trial mixed methods

Aileen Grant, Sarah Dean, Jean Hay-Smith, Suzanne Hagen, Doreen McClurg, Anne Taylor, Marija Kovandzic, Carol Bugge To cite: Grant A, Dean S, HaySmith J, et al. Effectiveness and cost-effectiveness randomised controlled trial of basic versus biofeedback-mediated intensive pelvic floor muscle training for female stress or mixed urinary incontinence: protocol for the OPAL (optimising pelvic floor exercises to achieve long-term benefits) trial mixed methods longitudinal qualitative case study and process evaluation. BMJ Open 2019;9:e024152. doi:10.1136/ bmjopen-2018-024152