per 100,000 population
per 100,000 population per year
per 100,000 population
per 100,000 population per year
Introduction
I think the introduction could be more focused, particularly by shortening the background information on risk factors.
incidence rate of 26.7
The unit of the age-standardized incidence rates (e.g., 26.7 vs 13.4) should be specified (for example, cases per how much population per year).