- Correspondence to Dr Verena Keitel, Clinic for Gastroenterology, Hepatology and Infectious Diseases, Heinrich-Heine-University, Moorenstrasse 5, Düsseldorf D-40225, Germany;
- Received February 25, 2015
- Revised August 14, 2015
- Accepted September 1, 2015
- First published September 29, 2015.
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