- Correspondence to Maj M J Stacey, Department of Surgery and Cancer, Imperial College, Hammersmith Hospital, Du Cane Road, London W120HS, UK;
- Received February 15, 2015
- Revision received March 16, 2015
- Accepted April 16, 2015
- First published June 2, 2015.
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- Data supplement 1 - Online supplement
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