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Armitage JN, van der Meulen JH; Royal College of Surgeons Co-morbidity Consensus Group.Armitage JN, et al.Br J Surg. 2010 May;97(5):772-81. doi: 10.1002/bjs.6930.Br J Surg. 2010.PMID: 20306528
Johal A, Mitchell D, Lees T, Cromwell D, van der Meulen J.Johal A, et al.Br J Surg. 2012 Jan;99(1):66-72. doi: 10.1002/bjs.7772. Epub 2011 Nov 21.Br J Surg. 2012.PMID: 22105834