Meiyappan, K., Dhiman, P., Rajendiren, S., Thayagarajan, K. and Raghavan S, S. (2017) “Serum nitric oxide and homocysteine as biomarkers of ectopic pregnancy”, International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 4(1), pp. 66–70. Available at: https://www.ijrcog.org/index.php/ijrcog/article/view/1811 (Accessed: 14 October 2025).