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机译:Vaccination saves lives: a real-time study of patients with chronic diseases and severe COVID-19 infection
Indian Council of Medical Research (ICMR),Indian Council Med Res;
Postgrad Inst Med Educ & Res;
Gandhi Med CollAll India Inst Med SciColl Med,Sagore Dutta HospMed CollInfect Dis & Beliaghata Gen HospSmt NHL,Municipal Med CollNatl Inst Med Stat,CIMS HospChristian Med Coll & Hosp;