- Correspondence to Dr Jing-song Ou, Division of Cardiac Surgery, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhong Shan Er Road, Guangzhou 510080, P.R. China;
- Accepted 21 October 2011
- Published in print 1 March 2012.
- Published online 6 February 2012.
- Published first 22 November 2011.
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