Shah Masud Hayder; Shabarna Roy; Neha Karar; Dipanjan Halder; Rijwoana Aktar. To Study the Difference of Serum Vitamin D3 Level and Calcium Profile in Childhood Multitransfused Beta-Thalassemia Major Between Children Receiving Chelation Therapy and Those Not Receiving Chelation Therapy in a Tertiary Care Hospital, Kolkata. Asian J Med Sci 2025, 16, 44-50.