- Correspondence to Dr Surya P Bhatt, Division of Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham, THT 422, 1720, 2nd Avenue South, Birmingham, AL 35294, USA;
- Received October 2, 2012
- Revised February 18, 2013
- Accepted February 27, 2013
- First published March 23, 2013.
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