Usman, A., Shafique, M., Jalil, J., Amin, U., Zafar, S. I., & Qamar, K. (2019). COMPARISON OF DIAGNOSTIC ACCURACY OF TRANSPERINEAL SONOGRAPHY WITH THE TRANSVAGINAL ULTRASONOGRAPHY IN DETERMINING ACCURATE CERVICAL LENGTH. Pakistan Armed Forces Medical Journal, 69(1), 136-41. https://pafmj.org/PAFMJ/article/view/2511