Areeba Nasar, SadiqWadood Siddiqui, Aditya Pratap Singh, Anas Ahmad Khan, Nushrat Jahan and Neel Kamal Arora 2021. Anatomical Study of Variations of Sacral Hiatus and its Clinical Relevance in Caudal Epidural Block. International Journal of Health and Clinical Research. 4, 14 (Aug. 2021), 50–53.