McCallum, Richard W.
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Texas Tech Univ, Ctr Neurogastroenterol & GI Motil Gastroenterol He, Hlth Sci Ctr, Paul L Foster Sch Med, El Paso, TX USA
Univ Queensland, Brisbane, Qld, Australia
Texas Tech Univ, Hlth Sci Ctr El Paso, Internal Med, El Paso, TX 79409 USA Texas Tech Univ, Ctr Neurogastroenterol & GI Motil Gastroenterol He, Hlth Sci Ctr, Paul L Foster Sch Med, El Paso, TX USA