Zhang, M.; Lv, J.; Tian, X.; Zhang, Y. Analysis of the Optimal Timing for NIPT and the Detection of Fetal Abnormalities Based on Cluster Analysis and Gradient Boosting Techniques. IJPHMR 2026, 6 (2), 62-71. https://doi.org/10.62051/ijphmr.v6n2.07.