- Correspondence to Dr MeiLan K Han, Division of Pulmonary and Critical Care Medicine, University of Michigan Health System, 3916 Taubman Center, Box 5360, 1500 E. Medical Center Drive, Ann Arbor, MI 48109-5360, USA;
- Received October 1, 2011
- Accepted December 9, 2011
- First published February 8, 2012.
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