- Correspondence to Aurelius Omlin, Department of Oncology and Haematology, Kantonsspital St.Gallen, Rorschacherstrasse 959007 St .Gallen, Switzerland;
- Received January 30, 2017
- Revised March 6, 2017
- Accepted March 17, 2017
- First published May 2, 2017.
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