McCallum, Richard W.
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Texas Tech Univ, Hlth Sci Ctr, Paul L Foster Sch Med, Dept Internal Med, 4800 Alberta Ave, El Paso, TX 79905 USA
Texas Tech Univ, Hlth Sci Ctr, Paul L Foster Sch Med, Ctr Neurogastroenterol & GI Motil, 4800 Alberta Ave, El Paso, TX 79905 USA Texas Tech Univ, Hlth Sci Ctr, Paul L Foster Sch Med, Div Gastroenterol Hepatol & Nutr, 4800 Alberta Ave, El Paso, TX 79905 USA