Quỳnh LH, Trang PTT, Vững N Đăng. 58. Safe sex knowledge and the prevalence of sexual intercourse among 12th-grade students at Nguyen Trai high school in Thuong Tin district, Hanoi in 2023. TCNCYH [Internet]. 2025Oct.31 [cited 2026Nov.6];195(10):544-52. Available from: https://tapchinghiencuuyhoc.vn/index.php/tcncyh/article/view/3958