Table 1.

Characteristics and quality of the included studies

Study (author and year)	Country	Design	Setting	NOS	Follow-up	Primary end point
Zhou et al. (2020) [17]	China	Observational	Single center	4 (2,0,2)	In hospital	Death
Zhang et al. (2020) [18]	China	Observational	Single center	4 (2,0,2)	In hospital	Death
Takeda et al. (2020) [19]	Japan	Observational	Multicenter	4 (2,0,2)	In hospital	Death
Jacobs et al. (2020) [20]	USA	Observational	Multicenter	4 (2,0,2)	In hospital	Death
Yang et al. (2020) [21]	China	Observational	Single center	6 (2,2,2)	In hospital	Death
Ruan et al. (2020) [22]	China	Observational	Single center	6 (2,2,2)	In hospital	Death
Li et al. (2020) [23]	China	Observational	Single center	6 (2,2,2)	In hospital	Death
Guan et al. (2020) [24]	China	Observational	Single center	6 (2,2,2)	In hospital	Death
Zeng et al. (2020) [25]	China	Observational	Single center	4 (2,0,2)	In hospital	Death
Beyls et al. (2020) [26]	France	Observational	Single center	5 (3,0,2)	4 weeks after discharge	Death
Osho et al. (2020) [27]	USA	Observational	Single center	4 (2,0,2)	In hospital	Death
Haye et al. (2020) [28]	France	Observational	Single center	4 (2,0,2)	In hospital	Death

NOS Newcastle-Ottawa scale (total score with 3 numbers of subdivision: selection of study groups, comparability of groups, and ascertainment of exposure)