SULTAN, Mohammad. Covid-19: A year into the pandemic, what has changed from the first, to the second, and third waves?. DALHOUSIE MEDICAL JOURNAL, [S. l.], v. 47, n. 2, 2021. DOI: 10.15273/dmj.Vol47No2.11028. Disponível em: https://ojs.library.dal.ca/DMJ/article/view/11028. Acesso em: 23 nov. 2024.