- Correspondence to Dr Hyun-Sook Chi, Department of Laboratory Medicine, Asan Medical Center, 86 Asanbyeongwon-gil, Songpa-gu, Seoul 138-736, Korea;
- Received 19 August 2012
- Revised 11 November 2012
- Accepted 15 November 2012
- Published online 21 April 2013.
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