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Christopher J Danford, Hirsh D Trivedi, Konstantinos Papamichael, Elliot B Tapper, Alan Bonder 
World J Gastroenterol 24(31):3513-3520. Published online Aug 21, 2018. doi: 10.3748/wjg.v24.i31.3513
Basic Study
Retrospective Cohort Study
Prospective Study
Peter Baltes, Marc Bota, Jörg Albert, Michael Philipper, Hans-Georg Hörster, Friedrich Hagenmüller, Ingo Steinbrück, Ralf Jakobs, Matthias Bechtler, Dirk Hartmann, Horst Neuhaus, Jean-Pierre Charton, Rupert Mayershofer, Horst Hohn, Thomas Rösch, Stefan Groth, Tanja Nowak, Peter Wohlmuth, Martin Keuchel 
World J Gastroenterol 24(31):3556-3566. Published online Aug 21, 2018. doi: 10.3748/wjg.v24.i31.3556