Differentiation between slow and rapid distention-induced secondary esophageal peristalsis in opossum: M. Kusano1, W.J. Hogan, J.L. Bonnevier, I.M. Lang, B.T. Massey, O. Kawamura1, R. Shaker. MCW Dysphagia Institute, Depts. of Medicine, Radiology and Otolaryngology, Medical College of Wisconsin, Milwaukee, WI, 1First Dept. of Internal Medicine, Gunma University, Gunma, Japan