- Correspondence to Dr Sally E Wenzel, Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh Asthma Institute at UPMC/UPSOM, 3459 Fifth Avenue, NW 628 Montefiore, Pittsburgh, PA 15213, USA;
- Received January 13, 2012
- Accepted August 23, 2012
- First published September 26, 2012.
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