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The geographical distribution of eligible studies by country (a), and the number of studies that focused on air pollutants (b), temperature (b), cause-specific cardiovascular diseases (d), and cause-specific respiratory diseases (e). CVD, cardiovascular disease; RD, respiratory disease; MI, myocardial infarction; OHCA, out-of-hospital cardiac arrest; IHD, ischemic heart disease; COPD, chronic obstructive pulmonary disease.
