Shah, Rajiv, Ajaya Singh Thapa, Nirmal Lamichhane, and Sudeep Raj KC. “Safety and Efficacy of Spinal Anaesthesia in Percutaneous Nephrolithotomy”. Journal of Nepal Medical Association 55, no. 204 (December 23, 2016): 61-66. Accessed January 29, 2020. http://www.jnma.com.np/jnma/index.php/jnma/article/view/2846.