Consumption and Informal Trade of Milk in the North of Antioquia (Colombia) by Richard Zapata-Salas, José F. Guarín, Leonardo A. Ríos-Osorio

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HEAVY HYDROCARBON-COAL SURFACTANT-WATER-CCTA MIXTURE TECHNOLOGY. SEMI-INDUSTRIAL EVALUATION by G LEAL, J. L GROSSO, O. J SUÁREZ, F GUARÍN, M FORERO, H VIDALES, R BARRERO, E. K GUZMÁN, E AFANADOR, J CORREDOR

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In Young Patients Undergoing Total Hip Arthroplasty, Is There a Correlation Between Activity Level and Wear of Highly Cross-Linked Polyethylene? by Sergio F. Guarin Perez, MD, Diego J. Restrepo, MD, Sheng-Hsun Lee, MD, Michael B. Stuart, MD, Robert T. Trousdale, MD, Daniel J. Berry, MD, Rafael J. Sierra, MD

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