- Correspondence to Cynthia A James, Division of Cardiology, Department of Medicine, The Johns Hopkins Hospital, Carnegie 568D, 600 North Wolfe Street, Baltimore MD 21287, USA;
- Received August 31, 2015
- Revised November 24, 2015
- Accepted November 26, 2015
- First published December 30, 2015.
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- Data supplement 1 - Online supplement
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