- Correspondence to Dr David Y Graham, Department of Medicine, Baylor College of Medicine and Michael E DeBakey Veterans Affairs Medical Center, RM 3A-318B (111D), 2002 Holcombe Boulevard, Houston, TX 77030, USA;
- Received March 4, 2016
- Revised March 14, 2016
- Accepted March 21, 2016
- First published April 7, 2016.
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