Author affiliations and addresses:
1 Gynaecology Diagnostic and Outpatient Treatment Unit, Lower Ground Floor, Elizabeth Garrett Anderson Wing, University College London Hospital, 235 Euston Road, London NW1 2BU, UK.
2 MRC Centre for Reproductive Health, Queen’s Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH 16 4TJ, UK.
Corresponding author: Elisabeth Bean
Email: elisabeth.bean@nhs.net
Telephone: +44 (0)20 344 76515
Fax: +44 (0)20 344 76598
Running title: Prevalence of endometriosis in pregnancy