1. Central Intelligence Agency. Country comparison: Obesity – Adult prevalence rate. The World Factbook. 2015. Accessed at https://www.cia.gov/library/publications/resources/the-world-factbook/rankorder/2228rank.html .
2. Lashen H, Fear K, Sturdee DW. Obesity is associated with increased risk of first trimester and recurrent miscarriage: Matched case–control study. Hum Reprod. 2004;19(7):1644–6.
3. Confidential enquiry into maternal and child health. Why mothers die 2000–2002. Midwifery summary and key recommendations. London: Royal college of obstetricians and gynaecologists; 2004.
4. Centre for Maternal and Child Enquiries. 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. BJOG. 2011;118 Suppl 1:1–203.
5. Knight M, Kurinczuk JJ, Spark P, Brocklehurst P. Extreme obesity in pregnancy in the United Kingdom. Obstet Gynecol. 2010;115:989–97.