S. Wibowo, K. T. Wulandari, and N. Amalia, “The Effect of Vitamin D₃ Supplementation on Diarrhea Frequency, Duration, and Neutrophil-to-Lymphocyte Ratio (NLR) in Children with Diarrhea”, Trends Immunother., vol. 10, no. 1, pp. 130–143, Jan. 2026.