- Correspondence to Dr Oscar Patterson-Lomba, Department of Biostatistics, Harvard T.H. Chan School of Public Health, 677 Huntington Ave, Boston, MA 02115, USA;
- Received 30 October 2014
- Revised 31 March 2015
- Accepted 4 April 2015
- Published in print 1 December 2015.
- Published online 19 November 2015.
- Published first 28 April 2015.
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