Leeuw, J.W. de

sphincter anal sphincter injury delivery anal sphincter damage women study injury anal canal complaint incontinence anorectal complaints damage anal endosonography anal sphincter canal anorectal muscle risk factors group factor control result perineal episiotomy anale defect endosonography rupture anal manometry degree rectal degree perineal tears manometry anale sfincters tijdens mediolateral episiotomy obstetric sphincter defects development mediolateral sfincter degree perineal ruptures pressure beschadiging relationship obstet anatomy occurrence difference rectum repair puborectalis muscle ga door sphincter damage bevalling continence follow-up analysis risk factor anal sphincter defects anale sfincters level patient pectinate line tijden forcep table number anal mucosa effect klachten increase control group puborectali chapter vraag gynecol vacuum extraction vrouwen study group vaginale