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Siregar, A.P., Rukiah Chodilawati and Mgs. Irsan Saleh 2023. The Effect of Giving Vitamin D Supplements on Improving Ejection Fraction in Heart Failure Patients at Dr. Mohammad Hoesin General Hospital, Palembang, Indonesia. Bioscientia Medicina : Journal of Biomedicine and Translational Research. 7, 10 (Sep. 2023), 3628-3636. DOI:https://doi.org/10.37275/bsm.v7i10.869.