Thach, Pham Ngoc, Nguyen Tuan Anh, Nguyen Viet Hang, and Le Van Duyet. 2020. “Two Recovered COVID-19 Cases Testing Positive Again for SARS-CoV-2 After Discharge in Hanoi, Vietnam”. Archives of Clinical and Medical Case Reports 4 (5):766-73. https://fortunejournals.org/ojs/index.php/acmcr/article/view/22381.