- Correspondence to Professor Terence O'Neill, Faculty of Medical and Human Sciences, Arthritis Research UK Centre for Epidemiology, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK;
- Received November 3, 2014
- Revised April 22, 2015
- Accepted April 23, 2015
- First published June 26, 2015.
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- Data supplement 1 - Online supplement
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