Bibliographical noteFunding Information:
This research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors. This work was supported by PHE , which is an executive agency of the Department of Health & Social Care (DHSC). The authors had sole responsibility for the study design, data collection, data analysis, data interpretation and writing. FGS was partly supported by the National Institute for Health Research (NIHR) Health Protection Research Unit in Modelling and Health Economics , a partnership between Public Health England, United Kingdom, Imperial College London and London School of Hygiene and Tropical Medicine (Grant No. NIHR200908 ). This work was supported by the Wellcome Trust (Grant No. 203268/Z/16/Z ). The views expressed are those of the authors and not necessarily those of DHSC, NHS, NIHR or PHE.