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