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Rogelio Pérez-Padilla 1, Jorge Salas-Hernández 1, Moisés Selman 1
1 Investigación en Tabaquismo y EPOC, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
*Correspondence: Jorge Salas-Hernández. Email: jsalas@iner.gob.mx
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