2.Quintero, RA, Morales, WJ, Allen, MH, et al. Staging of twin–twin transfusion syndrome. J Perinatol 1999;19(8 Pt 1):550–5.
3.Revelle, K, Morrish, P. Headaches in pregnancy. Obstet Gynaecol 2014;16(3):179–84.
4.Roberts, D, Dalziel, SR. Antenatal corticosteroids for accelerating fetal lung maturation for women at risk of preterm birth. Cochrane Database Syst Rev 2006;(3):CD004454.
5.National Institute for Health and Clinical Excellence. Diabetes in Pregnancy. Management of Diabetes and its Complications from Pre-conception to the Postnatal Period. March, 2008. [https://www.nice.org.uk/guidance/ng63]