McCallum, Richard W.
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Texas Tech Univ, Hlth Sci Ctr, Dept Internal Med, Paul L Foster Sch Med, El Paso, TX USA
Univ Kansas, Med Ctr, Dept Med, Div Gastroenterol & Hepatol, Kansas City, KS 66103 USA
Univ Kansas, Med Ctr, Div Gastrointestinal Motil, Kansas City, KS 66160 USA Texas Tech Univ, Hlth Sci Ctr, Dept Internal Med, Paul L Foster Sch Med, El Paso, TX USA