1. Department of UrogynaecologySt Marys HospitalImperial NHS Trust, PaddingtonLondonUK
2. Department of Epidemiology and BiostatisticsImperial College LondonLondonUK
3. Department of UrogynaecologyKing's College HospitalLondonUK
4. Department of Obstetrics and GynaecologyQueen's Park HospitalBlackburnUK
5. Pfizer, Inc.New YorkNew York