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สีตะวัน ส, สีตะวัน พ. STUDY THE PROCESS OF DEVELOPING THE QUALITY OF LIFE THE ELDERLY IN THE ELDERLY SCHOOL DEN CHAI DISTRICT, PHRAE PROVINCE. J Primary Heath Care N [Internet]. 2025Aug.29 [cited 2026Sep.21];35(2):1-9. Available from: https://www.thaidj.org/index.php/NRTC/article/view/16577