- Correspondence to Dr Hashem B El-Serag,Department of Gastroenterology and Hepatology, Baylor College of Medicine, MEDVAMC 152, 2002, Holcombe Blvd., Houston, TX 77030, USA;
- Received November 21, 2014
- Revised July 15, 2015
- Accepted July 22, 2015
- First published August 26, 2015.
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- Data supplement 1 - Online supplement
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