Difference in presentation, outcomes, and hospital epidemiologic trend of COVID-19 among first, second, and third waves: a review of hospital records and prospective cohort study R Mahmud, MA Islam, ME Haque, MDA Hussain, MR Islam, FB Monayem, ... Annals of Medicine and Surgery 85 (8), 3816–3826, 2023 | 1 | 2023 |