Studies sited: 

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* Brigstocke S. MIDIRS Midwifery Digest, vol 24, no 2, 2014, pp 157-160

#Meghan A Bohren and Sarah Chapman Cochrane review
† Hodnett ED, Gates S, Hofmeyr G, Sakala C. Continuous support for women during childbirth. Cochrane Database of Systematic Reviews 2013, Issue 7. Art. No.: CD003766. DOI: 10.1002/14651858.CD003766.pub5 and Bohren MA, Hofmeyr GJ, Sakala C, Fukuzawa RK, Cuthbert A. Continuous support for women during childbirth. Cochrane Database of Systematic Reviews 2017, Issue 7. Art. No.: CD003766. DOI: 10.1002/14651858.CD003766.pub6. All found on the Doula UK website.