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J Physiol 236(2):303326 Costa M, Brookes SJ, Steele PA, Gibbins I, Burcher E, Kandiah CJ (1996) Neurochemical classification of myenteric neurons in the guinea-pig ileum

This may be due to limitations of the study such as enrollment of patients with many comorbidities and a high rate of patient dropout, to name but a few

doi: 10.1073/pnas.1609246113 225 WolinskyJ

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