1. NHS maternity statistics 2011-12. https://digital.nhs.uk/data-and-information/publications/statistical/nhs-maternity-statistics/2011-12
2. Saving mothers’ lives: reviewing maternal deaths to make motherhood safer: 2006-08. The eighth report on Confidential Enquiries into Maternal Deaths in the United Kingdom;Centre for Maternal and Child Enquiries (CMACE);BJOG,2011
3. Knight M, Nair M, Tuffnell D, Shakespeare J, Kenyon S, Kurinczuk JJ (eds). on behalf of MBRRACE-UK. Saving lives, improving mothers’ care: Lessons learned to inform maternity care from the UK and Ireland Confidential Enquiries into Maternal Deaths and Morbidity 2013-15. National Perinatal Epidemiology Unit, University of Oxford, 2017.
4. National Institute for Health and Care Excellence. Ectopic pregnancy and miscarriage: diagnosis and initial management (NICE guideline NG126). 2019. https://www.nice.org.uk/guidance/ng126.