Fig. 2.

Spatiotemporal distribution and roadmap of intervention studies. (A) Temporal distribution of publications. (B) Nationwide interventions counted by the capital city; those involving specific districts and counties were counted by the jurisdictional city or provincial capital; model simulation studies with unclear locations were counted by the address of the first author's unit. Studies involving five cities or fewer were counted for each city; studies covering the entire country or more than five cities were counted once by capital city. For research involving multiple countries, if there was a specific location, it was counted once for each specific city; otherwise, it was counted according to the capital of each country; Global-scale studies such as the Global Burden of Disease were not counted. (C) Overall research roadmap for all three interventions.