L. H. Yuwantina, A. D. Laksono, D. Chalidiyanto, and A. S. Adji, “Geospatial patterns and a two-year comparison of outpatient hospital utilization in Indonesia: An ecological analysis of 38 provinces, 2021–2024”, Narra X, vol. 4, no. 3, p. e338, Nov. 2026.