- Correspondence to Dr Marek Bugajski, Department of Gastroenterological Oncology, The Maria Sklodowska-Curie Memorial Cancer Centre and Institute of Oncology, 02-781, Warsaw, Poland;
- Received February 6, 2017
- Revised July 31, 2017
- Accepted September 7, 2017
- First published September 28, 2017.
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