Mi, B., Chen, L., Tong, D., Panayi, A.C., Ji, F., Guo, J., Hou, Z., Zhang, Y., Xiong, Y. and Liu, G. 2020. Delayed surgery versus nonoperative treatment for hip fractures in post-COVID-19 arena: a retrospective study of 145 patients. Acta Orthopaedica. 91, 6 (Sep. 2020), 639–643. DOI:https://doi.org/10.1080/17453674.2020.1816617.