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Lankisch PG, Koop H, Otto J, Oberdieck U, Winckler K, Wolfrum DI.Lankisch PG, et al. Among authors: otto j.Digestion. 1977;16(1-2):160-4. doi: 10.1159/000198066.Digestion. 1977.PMID: 615728
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Lankisch PG, Schreiber A, Otto J.Lankisch PG, et al. Among authors: otto j.Dig Dis Sci. 1983 Jun;28(6):490-3. doi: 10.1007/BF01308149.Dig Dis Sci. 1983.PMID: 6602697