PROPEL: implementation of an evidence based pelvic floor muscle training intervention for women with pelvic organ prolapse: a realist evaluation and outcomes study protocol oleh Margaret Maxwell, Karen Semple, Sarah Wane, Andrew Elders, Edward Duncan, Purva Abhyankar, Joyce Wilkinson, Douglas Tincello, Eileen Calveley, Mary MacFarlane, Doreen McClurg, Karen Guerrero, Helen Mason, Suzanne Hagen