1. Bump RC, Norton PA. Epidemiology and natural history of pelvic floor dysfunction. Obstet Gynecol Clin N Am. 1998;25:723–46.
2. Maher C, Baessler K, Barber M, Cheon C, Consten E, et al. Committee 15. Pelvic organ prolapse surgery. In: Abrams P, Cardozo L, Wagg A, Wein A, editors. Incontinence. 6th ed. Bristol UK: ICI-ICS International Continence Society; 2017. p. 1858–992.
3. Food and Drug Administration (FDA): Guidance for Industry on Patient-Reported Outcome Measures: Use in Medical Product Development to Support Labeling Claims. Guidance for Industry. Clinical - Medical, Good Clinical Practices. 2009. https://www.fda.gov/media/77832/download. Accessed 20 July 2019
4. Cardozo L, Staskin D. Textbook of female urology and Urogynecology. Boca Raton: CRC Press; 2017.
5. Abrams P, Cardozo L, Wagg A, Wein A. Incontinence 6th edition. ICI-ICS. International Continence Society, Bristol UK; 2017.