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Ningtiyas MES. THE EFFECT OF THE COMBINATION OF WHATSAPP AND FACEBOOK SOCIAL MEDIA ON KNOWLEDGE MASTERY AND ATTITUDES OF OBESE TEENAGERS IN BALONGPANGGANG DISTRICT, GRESIK REGENCY. JGKN [Internet]. 2023 Mar. 20 [cited 2025 Jun. 24];3(1):206-14. Available from: https://ejournal.unesa.ac.id/index.php/GIZIUNESA/article/view/50454