- Correspondence to Professor Denise Kendrick, Division of Primary Care, School of Medicine, Floor 13 Tower Building, University Park, Nottingham NG7 2RD, UK;
- Received February 24, 2015
- Revised July 23, 2015
- Accepted August 6, 2015
- First published December 10, 2015.
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- Data supplement 1 - Online table
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