Johnson & Johnson (JNJ)’s vaginal sling, used to support the urethra after surgery to treat weakened pelvic muscles, cuts in half a women’s risk of subsequently developing incontinence, a study found. About 1 in 5 women need surgery to fix bulges and complications caused when the pelvic muscles weaken and allow organs such as the bladder and uterus to fall into the vagina. The procedure to add the sling, a smaller version of the J&J mesh used to support organs, lifts the bladder and relieves pressure to prevent incontinence that develops in one-quarter to half of women after the surgery, researchers said.