1. Prof. and Dir., Div. of Gastroenterology, Dept. of Internal Medicine, Univ. of Iowa Hospitals and Clinics, Iowa City, Iowa
2. Adjunct Asst. Professor, Div. of Energy Engrg. and Research Engr., Inst. of Hydraulic Research, The Univ. of Iowa, Iowa City, Iowa
3. Prof. of Fluid Mechanics, Div. of Energy Engrg. and Research Engr., Inst. of Hydraulic Research, The Univ. of Iowa, Iowa City, Iowa; Aff.M.ASCE