- Correspondence to Dr Hardeep Singh, Houston VA HSR&D Center of Excellence, Michael E. DeBakey Veterans Affairs Medical Center and the Section of Health Services Research, Department of Medicine, Baylor College of Medicine, VA Medical Center (152) 2002 Holcombe Blvd, Houston, TX 77030, USA;
- Accepted August 6, 2013
- First published September 18, 2013.
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