The Efficacy of Digital Educational Interventions on Parental HPV Knowledge and Attitude, and Their Children's Vaccination Rates

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