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Manometric and electromyographic recordings seen with normal (A) and abnormal (B) defecation. EMG: Electromyography; Footnote: Wald A. Manometry. In: Schuster MM, Crowel MD, Koch KL, eds. Atlas of Gastrointestinal Motility in Health and Disease 2nd ed, Hamilton, and Ontario: BC Decker; 2002: 289-303.
