- Correspondence to Dr G David Batty, Department of Epidemiology and Public Health, University College London, London, 1-19 Torrington Place, London, UK, WC1E 6BT.E.;
- Received January 25, 2016
- Revised June 16, 2016
- Accepted July 3, 2016
- First published August 12, 2016.
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