Salud Pública de México Print version ISSN 0036-3634
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ESPINOSA-DE LOS MONTEROS, Luz Elena et al.Streptococcus pneumoniae isolates in healthy children attending day-care centers in 12 states in Mexico. Salud pública Méx [online]. 2007, vol.49, n.4, pp.249-255.
ISSN 0036-3634.