Study		Exclusion reasons	Remarks	Reference(s)
Rimland, 2020	single-arm
Kragholm, 2020	population based cohort retrospective			Kragholm K et al. Clinical and Translational Science 10.1111/cts.12904
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
Ye, 2020	-	no control group		Ye J. Med. Virol. 2020; : 10.1002/jmv.25882
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
Toniati, 2020	observational study	no control group		Toniati Autoimmun Rev 2020; 19:102568 10.1016/j.autrev.2020.102568
Price, 2020	retrospective cohort	no control group		Price Chest 2020; : 10.1016/j.chest.2020.06.006