Persistence of SARS-CoV-2 RNA in the nasopharyngeal, blood, urine, and stool samples of patients with COVID-19: a hospital-based longitudinal study oleh Farahnaz Joukar, Tofigh Yaghubi Kalurazi, Mahmoud Khoshsorour, Sonbol Taramian, Lida Mahfoozi, Heydar Ali Balou, Alireza Jafarinezhad, Aydin Pourkazemi, Ezat Hesni, Mehrnaz Asgharnezhad, Mohammad Shenagari, Issa Jahanzad, Mohammadreza Naghipour, Saman Maroufizadeh, Fariborz Mansour-Ghanaei