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机构:
Texas Tech Univ, Hlth Sci Ctr, Paul L Foster Sch Med, Dept Biomed Sci,Div Biostat & Epidemiol, Houston, TX 77030 USA Texas Tech Univ, Hlth Sci Ctr, Paul L Foster Sch Med, Dept Internal Med,Div Gastroenterol, El Paso, TX 77030 USA