Design and methodology of the 'endometriosis and pelvic floor dysfunction' (EndoPFD) multicenter cross-sectional study.

Objective: To assess the prevalence and the characteristics of pelvic floor dysfunction (PFD) in women with endometriosis.

Methods: This is a methodological paper that describes the 'Endometriosis and Pelvic Floor Dysfunction' (EndoPFD) multicenter study protocol. It involves three sites: the University Hospital of Pisa, the San Raffaele Hospital of Milan and the Vanvitelli University Hospital of Naples.