Please see attached a link of Dr Rosemary Lin’s work in association with Molly et al. which has now been published on BMJ open.
http://bmjopen.bmj.com/content/7/3/e013515
Molly Courtenay, Samantha Rowbotham, Rosemary Lim, Rhian Deslandes, Karen Hodson, Katie MacLure, Sarah Peters, Derek Stewart