Scherrer, J.
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St Louis Univ, Sch Med, St Louis VAMC, Res Serv, St Louis, MO 63103 USA
St Louis Univ, Sch Med, Dept Family & Community Med, St Louis, MO 63103 USA St Louis Univ, Div Gastroenterol & Hepatol, Dept Internal Med, St Louis, MO 63103 USA