Zhou, Cindy Ke
Sutcliffe, Siobhan
Welsh, Judith
Mackinnon, Karen
Kuh, Diana
Hardy, Rebecca
Cook, Michael B
Article History
Received: 22 October 2015
Revised: 7 January 2016
Accepted: 24 January 2016
First Online: 1 March 2016
Change Date: 29 March 2016
Change Type: Update
Change Details: This paper was modified 12 months after initial publication to switch to Creative Commons licence terms, as noted at publication
Competing interests
: The authors declare no conflict of interest.