Table 2. Mixed methods assessment tool quality assessment matrix for quantitative non-randomized studies.

Author	Are research questions clear?	Do the collected data allow the research questions to be addressed?	Are the participants representative of the target population?	Are measurements appropriate regarding both the outcome & exposure?	Are there complete outcome data?	Are the confounders accounted for in the design and analysis?	During the study period, does the exposure occur as intended?	Legend: + Yes —No ? Unclear
Azar et al. 2020 [37]	+	+	+	?	+	?	+
Baggett et al. 2020 [54]	+	+	+	+	+	—	+
Dai et al. 2020 [62]	+	+	?	+	+	—	+
de Lusignan et al. 2020 [36]	+	+	?	+	+	?	+
Fan et al. 2020 [58]	+	+	?	?	+	+	+
Gold et al. 2020 [42]	+	?	?	+	+	?	+
Hastie et al. 2020 [35]	+	?	—	+	+	+	?
Jia et al. 2020 [60]	+	+	?	+	+	—	+
Lechien et al 2020 [47]	+	+	—	+	?	+	?
Li et al. 2020 [76]	+	+	?	+	+	+	+
Mehta et al. 2020 [56]	+	+	+	+	+	?	+
Mosites et al. 2020 [69]	+	+	?	+	+	—	+
Nobel et al. 2020 [39]	+	+	+	+	+	?	+
Ouyang et al. 2020 [64]	+	?	?	+	+	—	+
Shi et al. 2020 [73]	+	+	+	—	+	?	+
Y. Sun et al. 2020 [38]	+	+	?	?	+	—	+
Toussie et al. 2020 [41]	+	+	?	+	+	?	?
R. Wang et al. 2020 [61]	+	+	?	+	+	—	+
X. Wang et al. 2020 [63]	+	+	+	+	+	—	+
Xiao et al. 2020 [74]	+	—	?	+	+	—	—
Yan et al. 2020 [40]	+	+	+	+	+	—	+
Yu et al. 2020 [66]	+	+	?	?	+	—	+
Zhang et al. 2020 [75]	+	+	?	+	+	—	+