- Correspondence to Professor Man-Fung Yuen, Department of Medicine, The University of Hong Kong, Hong Kong; and Professor Kwang-Hyub Han, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea;
- Received 22 April 2013
- Revised 5 August 2013
- Accepted 6 August 2013
- Published online 5 May 2014.
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