The goal of this clinical trial is to examine in the parental HPV knowledge and attitude, and their children's completion rates in Indonesia. The main question\[s\] it aims to answer are: * Is the digital educational intervention in improving parent's HPV knowledge in the intervention group compared to the control group? * Is the digital educational intervention in improving parent's attitude toward HPV vaccine in the intervention group compared to the control group? * Is the digital educational intervention more effective in increasing children's HPV vaccine completion rates in the intervention group compared to the control group? Participants in intervention group will: * watch a 8 minutes video in front of class at once. * after video education intervention, in 2 weeks, participants received 2 reminder messages before first and second vaccination event, respectively. Participants in control group will: • Receive usual announcement regarding vaccine by staff
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Human Papillomavirus Knowledge Scale (HPV-KS)
Timeframe: measured at pre-test/baseline (before the 8-minutes video) and post-test (immediately after watching the 8-minutes video).
Attitude towards HPV vaccine scale by Carolina HPV Immunization Attitudes and Beliefs Scale (CHIAS)
Timeframe: measured at pre-test/baseline (before the 8-minutes video) and post-test (immediately after watching the 8-minutes video).
Vaccine completion rate
Timeframe: The evaluation was conducted twice, at week 2 post video intervention or at first vaccination event and 6 months later at second vaccination event.