- Correspondence to Dr Martie van Tongeren, Centre for Occupational and Environmental Health, Centre for Epidemiology, Division of Population Health, Health Services Research and Primary Care, School of Health Sciences, Faculty of Medicine, Biology and Health, University of Manchester, Oxford Road, Manchester, M13 9PL, UK;
- Received 30 December 2016
- Revised 8 June 2017
- Accepted 20 June 2017
- Published online 3 October 2017.
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