Prastyo, Cahya Edi, and Dian Meutia Sari. 2026. “Challenges of Sustainability of Employer-Based Retirement Healthcare Services in Indonesia: A Longitudinal Analysis of Demographic Transition and Healthcare Costs 2019–2023”. Jurnal Ilmiah Kesehatan 18 (1):238 – 249. https://doi.org/10.37012/jik.v18i1.3714.