Programmed cell death-1 and its ligands: Current knowledge and possibilities in immunotherapy Bojana Gutic; Tatjana Bozanovic; Aljosa Mandic; Stefan Dugalic; Jovana Todorovic; Dejana Stanisavljevic; Miroslava Gojnic Dugalic; Demet Sengul; Dzenana A. Detanac; Ilker Sengul; Dzemail Detanac; José Maria Soares;

Effect of a Single High-Dose Vitamin D3 on the Length of Hospital Stay of Severely 25-Hydroxyvitamin D-Deficient Patients with COVID-19 Igor H. Murai; Alan L. Fernandes; Leila Antonangelo; Bruno Gualano; Rosa Maria Rodrigues Pereira;