Table 1.

The 3 HPV-related Twitter datasets, their date ranges, keywords used for data collection, and total number of tweets

Data source	Date range	Keywordsa	Tweets b(N = 2 598 033)
Present study	January 2016 to April 2018	cervarix, gardasil, hpv, human papillomavirus	2 238 433 (86.16)
Dunn et al11	January 2014 to December 2016	gardasil, cervarix, hpv + vaccin∗, cervical + vaccin∗	423 594 (16.30)
Du et at15	November 2015 to March 2016	cervarix, gardasil, hpv, human papillomavirus	184 468 (7.10)

^a“hpv + vaccin∗” means a tweet has to contain both hpv and a word starts with vaccin.

^bNote that there are overlaps across the 3 datasets. The percentage indicates the amount of tweets of each dataset over the total number of unique tweets combined.