Study		Exclusion reasons	Remarks	Reference(s)
Ahn, 2020	-			Ahn J. Korean Med. Sci. 2020; 35:e149 10.3346/jkms.2020.35.e149
Shen, 2020	-			Shen C JAMA 2020 Mar 27;323(16):1582-1589. 10.1001/jama.2020.4783
Zhang, 2020	-	no control group		Zhang Chest 2020; : 10.1016/j.chest.2020.03.039
Zhang, 2020	-	no control group		Zhang L Aging (Albany NY) 2020 Apr 22;12(8):6536-6542. 10.18632/aging.103102
Ye, 2020	-	no control group		Ye J. Med. Virol. 2020; : 10.1002/jmv.25882
Bargay-Lleonart, 2022	randomized controlled trial	no clinically relevant endpoint	The trial was terminated early due to the impossibility of recruitment due to the pandemic.	Bargay-Lleonart J J Clin Med 2022 May 27;11(11):3039. 10.3390/jcm11113039
Dai W, 2020	retrospective cohort	other	inadequate statistical analysis	Wei Dai, Jian Wu, Tianfu Li, Jiawei Shen, Rongrong Pang, Bangshun He, Tao Luo, Yanju Guo, Yang Yang, Jun Zhao, Mingchao Zhang, Na Li, Ying Han, Qiuyue Wu, Weiwei Li, Xinyi Xia BMC Cardiovascular Diabetology