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RECRUITMENT
The participants were recruited from two high schools in Mianyang City of Sichuan province in China. The recruitment was conducted in September 2021. One was a private high school and the other was a public high school. The schools were anonymised due to confidentiality. The private school had a student population of around 3400. The public school had a student population of around 6000. Mianyang City is a moderately sized city located in southwest China.