Wu, Y. ., Hou, B. ., Liu, J. ., Chen, Y. ., & Zhong, P. . Risk Factors Associated With Long-Term Hospitalization in Patients With COVID-19: A Single-Centered, Retrospective Study. Frontiers in Medicine, 7, 315. https://doi.org/10.3389/fmed.2020.00315 (Original work published 2020)