Before revision:  CHECKED includes microblogs related to COVID-19  , identified by using a specific list of keywords  , covering a total 2120 microblogs published from December 2019 to August 2020.
After revision:  CHECKED includes microblogs related to COVID-19 from December 2019 to August 2020 , identified by using a specific list of keywords , covering a total 2120 microblogs published from December 2019 to August 2020.