Cynthia M Farquhar, Zhuoyang Li, Sarah Lensen, Claire McLintock, Wendy Pollock, Michael J Peek, David Ellwood, Marian Knight, Caroline SE Homer, Geraldine Vaughan, Alex Wang, Elizabeth Sullivan
BMJ Open. 2017; 7(10): e017713. Published online 2017 Oct 5. doi: 10.1136/bmjopen-2017-017713