Table 2.

Quality assessment of eligible studies.

References	A	B	C	D	E	F	G	H	I	J	Total
Xin et al. (2017a)	√		√			√	√		√	√	6
Zhao et al. (2020)	√	√				√	√		√	√	6
Song et al. (2019)	√		√			√	√		√	√	6
Pei et al. (2019)	√	√	√			√	√		√	√	7
Safakheil and Safakheil (2020)	√	√				√	√		√	√	6
Deng et al. (2019)	√		√			√	√		√	√	6
Jiang et al. (2018)	√	√				√	√		√	√	6
Zheng et al. (2019)	√		√			√	√		√	√	6
Li et al. (2019)	√		√				√		√	√	5
Sun et al. (2019)	√		√			√	√		√	√	6
Nalamolu et al. (2019b)	√	√	√			√	√		√	√	7
Nalamolu et al. (2019a)	√		√				√		√	√	5
Li G. et al. (2020)	√	√	√				√		√	√	6
Chen K. H. et al. (2016)	√	√				√	√		√	√	6
Ling et al. (2020)	√		√				√		√	√	5
Xin et al. (2013a)	√						√		√	√	4
Venkat et al. (2019)	√		√			√	√		√	√	6
Xin et al. (2017b)	√		√				√		√	√	5

A peer-reviewed journal; B temperature control; C animals were randomly allocated; D blind established model; E blinded outcome assessment; F use of anesthetic without significant intrinsic vascular protection activity; G appropriate animal model (diabetic, advanced age, or hypertensive); H calculation of sample size; I statement of compliance with animal welfare regulations; J statement of potential conflict of interests.