Safety and efficacy of placental mesenchymal stem cell-derived extracellular vesicle in severe COVID-19 patients: Phase I & II Clinical Trials by Mehdi Jahedi Zargar, Saeed Heidari Keshel, Saeid Kaviani, Mohammad Zahraei, Azadeh Izadyari Aghmiuni, Ali Amir Savadkoohi, Hamidreza Jamaati, Mohammad Samet, Mahsa Soufizomorrod, Mina Soufi Zomorrod, Faeze Sadat Heidari, Mohamad Reza Mirjalili, Payam Tabarsi, Mohammadreza Soroush, Rasoul Aliannejad, Mojtaba Javani, Hosein Shafiii, Mohammad Vasei, Masoud Soleimani

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