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APA Citation
Harraf, F., Schmulson, M., Saba, L., Niazi, N., Fass, R., Munakata, J., Diehl, D., Mertz, H., Naliboff, B., & Mayer, E. A. (1998). subtypes of constipation predominant irritable bowel syndrome based on rectal perception. Gut, 43(3), 388–394. http://access.bl.uk/ark:/81055/vdc_100135133208.0x000045