Zhang, M. et al. 2026. Analysis of the Optimal Timing for NIPT and the Detection of Fetal Abnormalities Based on Cluster Analysis and Gradient Boosting Techniques. International Journal of Public Health and Medical Research. 6, 2 (Feb. 2026), 62–71. DOI:https://doi.org/10.62051/ijphmr.v6n2.07.