Boletín médico del Hospital Infantil de MéxicoPrint version ISSN 1665-1146
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MARQUEZ-GONZALEZ, Horacio et al. COVID-19 pandemic: challenges ahead. Bol. Med. Hosp. Infant. Mex. [online]. 2020, vol.77, n.5, pp.242-251. Epub Oct 30, 2020. ISSN 1665-1146.