From the *Population Health Sciences, and
†National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Evaluation of Interventions in partnership with Public Health England, University of Bristol, Bristol, United Kingdom
Acknowledgments: This work was supported by the National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Evaluation of Interventions at the University of Bristol in partnership with Public Health England (PHE). The views expressed are those of the author and not necessarily those of the NHS, the NIHR, the Department of Health or Public Health England.
Conflict of Interest: None declared.
Correspondence: Patrick J Horner, MA, MD, FRCP, Population Health Sciences, University of Bristol Bristol, United Kingdom. E-mail: firstname.lastname@example.org.
Received for publication May 16, 2019, and accepted May 30, 2019.
Online date: June 11, 2019