Early alcohol or tobacco onset and transition to other drug use among students in the State of Morelos, Mexico by Wagner, F.A., Velasco-Mondragón, H.E., Herrera-Vázquez, M., Borges, G., Lazcano-Ponce, E.

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Comment analysis of the article on hepatitis B and C by Velasco Mondragón, H E, Leyva López, A

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Cross-sectional surveys by Hernández, B, Velasco-Mondragón, H E

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Disagreement with an educational intervention program on breast-feeding by Velasco Mondragón, H E, Leyva López, A G

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Possible bias in the selection of the control group by Velasco Mondragón, H E, Leyva López, A, Briseño Tavez, F, Escobar Meza, J, Fuentes Domínguez, J, Fuentes Román, L, Jiménez Gallegos, L

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