Sinha D, Shrivastava S, Shrivastava S. A comparative study of 4-hour versus 2-hour action line on who modified partograph. Int J Res Med Sci [Internet]. 2017 Feb. 20 [cited 2025 Oct. 14];5(3):876-9. Available from: https://www.msjonline.org/index.php/ijrms/article/view/2723