Covid Department MBAL “Sveti Mina” Plovdiv Bulgaria;
Covid Department MTB-Plovdiv Plovdiv Bulgaria;
Covid Department MBAL “Sveti Mina” Plovdiv Bulgaria;
Covid Department MBAL “Sveti Mina” Plovdiv Bulgaria;
Scientific Department Catalysis Laboratories Madrid Spain;
Immunomodulator; COVID-19; Hospitalization; Recovery; Antioxidant;