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Shumaila Yasin, Sarfraz Ahmed, Mariya Shahbaz, Sabeena Umer, Shazia Roman, Faiza Irshad 2023. Trisomy 21 Testing in Second Trimester: Reliability Comparison of Triple and Quadruple Testing in Pakistan. Pakistan Journal of Medical & Health Sciences. 17, 03 (Apr. 2023), 492. DOI:https://doi.org/10.53350/pjmhs2023173492.