S. Kanwal, N. Asif, S. Baqai, A. Ijaz, K. Bahadur, and S. Nida, “Determination of Medians of Biochemical Serum Markers in First Trimester of Healthy Pregnant Women in Tertiary Care Setup”, PAFMJ, vol. 72, no. 2, pp. 668–71, May 2022.