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Nesland A, Oktedalen O, Opstad PK, Serck-Hanssen A, Aase S, Berstad A.Nesland A, et al. Among authors: opstad pk.Scand J Gastroenterol. 1989 Jun;24(5):522-8. doi: 10.3109/00365528909093083.Scand J Gastroenterol. 1989.PMID: 2762751Clinical Trial.