Prevalence of nosocomial infections in Covid-19 patients admitted to the intensive care unit of Imam Khomeini complex hospital in Tehran - Mohammadnejad, Esmaeil; Dehghan Manshadi, Seyed Ali; Beig Mohammadi, Mohammad Taghi; Abdollai, Alireza; Seifi, Arash; Salehi, Mohammad Reza; Ghanei Gheshlagh, Reza (Iranian Journal of Microbiology, 2021)