- 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 December 30, 2016
- Revised June 8, 2017
- Accepted June 20, 2017
- First published September 25, 2017.
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