- Correspondence to Dr Surya P Bhatt, University of Alabama at Birmingham, Division of Pulmonary, Allergy and Critical Care Medicine, THT 422, 1720, 2nd Avenue South, Birmingham, AL 35294, USA;
- Received April 30, 2015
- Revised June 29, 2015
- Accepted July 21, 2015
- First published August 17, 2015.
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