Ratipark Tamornpark, Tawatchai Apidechkul, Panupong Upala, Chalitar Chomchoei, Fartima Yeemard. "Factors influencing early sexual initiation among hill tribe youths in Chiang Rai Province, Northern Thailand: A community-based cross-sectional study." PLoS ONE (2025). https://doi.org/10.1371/journal.pone.0321083