Ahmed, Z.
Preshaw, P. M.
Bauld, L.
Holliday, R.
Article History
Accepted: 11 June 2018
First Online: 23 November 2018
Competing interests
: <i>Richard Holliday is funded by a National Institute for Health Research Doctoral Research Fellowship (DRF201508077). This paper presents independent research funded by the National Institute for Health Research (NIHR). The views expressed are those of the authors and not necessarily those of the NHS, the NIHR or the Department of Health and Social Care</i>. <i>None of the authors reports any conflict of interest</i>.