Difference in mortality among individuals admitted to hospital with COVID19 during the first and second waves in South Africa a cohort study - Waasila jassat; Caroline Mudara; Lovelyn Ozougwu; Stefano Tempia; Lucille Blumberg; E et al; Anne Von Gottberg; Jinal Bhiman; Cheryl Cohen; Sibongile Walaza (My University, 2023)