Prescribing patterns and economic costs of proton pump inhibitors in Colombia - Machado-Alba, Jorge E; Fernández, Alejandra; Castrillón, Juan D; Campo, Carlos F; Echeverri, Luis F; Gaviria, Andrés; Londoño, Manuel J; Ochoa, Sergio A; Ruiz, Joaquín O (Colombia Médica, 2013)