Fig. 2.

Evidence mapping of complementary and alternative medicine interventions for COVID-19

In the bubble plot, each intervention had two-dimensional information including x-axis (overall risk of bias), y-axis (the number of included original studies in each systematic review (SR)) and bubble size (overall confidence level of the included SR assessed by AMSTAR 2 checklist). Bigger size represents more confidence of the assessed SR. The name of each bubble includes the name of intervention-symptom (or condition) of interests.