Gupta S, Gupta G, Sharda P, Mittal K. Study evaluating chronic abdominal pain and functional abdominal pain syndrome. Int J Res Med Sci [Internet]. 2017 Jan. 12 [cited 2025 Oct. 15];3(9):2290-8. Available from: https://www.msjonline.org/index.php/ijrms/article/view/1711