Khan, Sikandar Hayat, Ayesha Hafeez, and Raja Kamran Afzal. “Tapping The New Horizons In Prenatal Screening: Maternal Blood For Cell Free DNA Detection”. Pakistan Armed Forces Medical Journal 72, no. 1 (February 28, 2022): 1–2. Accessed May 6, 2024. https://www.pafmj.org/PAFMJ/article/view/8265.