Prevalence of chronic pelvic pain and primary dysmenorrhea in women of reproductive age in Ecuador - Rosero, Carmen Yolanda de Las Mercedes Villa; Mazin, Suleimy Cristina; Nogueira, Antonio Alberto; Costales, José Antonio Vargas; Rosa e Silva, Júlio César; Reis, Francisco José Candido dos; Poli Netto, Omero Benedicto (BMC Women's Health, 2022)