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Anne-Barbara Witte, Mauro D’Amato, Steen Seier Poulsen, Agneta Laurent, Svend Knuhtsen, Niels Bindslev, Mark Berner Hansen, Peter Thelin Schmidt 
World J Gastrointest Pathophysiol 4(2):28-36. Published online May 15, 2013. doi: 10.4291/wjgp.v4.i2.28