Made Ega Krisna Prananda, Ketut Ananda Wiratama, Irwin Lamtota Lumbanraja, and Igam Aditya Prasada, “A Comprehensive Systematic Review of The Relationship Between Serum Progesterone Levels and the Success of Maintaining Pregnancy in Threatened Miscarriage”, the int. j. of med. science and health, vol. 28, no. 1, pp. 123–175, Jan. 2026, doi: 10.70070/fvjjeg52.