SciELO - Scientific Electronic Library Online

 

Nova scientia
On-line version ISSN 2007-0705

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CALIXTO-CALDERON, Basilio et al. Pre-existing comorbidity, the highest risk factor for poor prognosis of COVID-19 among the Mexican population. Nova scientia [online]. 2021, vol.13, n.spe.  Epub May 28, 2021. ISSN 2007-0705.