Epidemiological and clinical risk factors related to severe COVID-19 in Iran: a multi-center study by Seyed Mohammad Hashemi-Shahri, Seyed Mohammad Nasiraldin Tabatabaei, Alireza Ansari-Moghaddam, Mahdi Mohammadi, Hassan Okati-Aliabad, Seyed Mehdi Tabatabaei, Hossein Ansari, Mohammadhadi Abbasi, Khodadad Sheikhzadeh, Mehdi Zanganeh Baygi, Majid Sartipi, Sharareh Sanei-Sistani, Ali Reza Salimi Khorashad, Fatemeh Ansari-Moghadam, Neda Torab, Tahereh Khalili, Ghasem Miri-Aliabad

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