- Correspondence to Dr Daniel R Murphy, Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), HSR&D Center of Excellence (152), 2002 Holcombe Boulevard, Houston, TX 77030 USA;
- Received February 2, 2013
- Revised June 20, 2013
- Accepted June 21, 2013
- First published July 19, 2013.
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