Singh, Maninder, Sandeep Kaushal, Kanchan Gupta, and Ajit Sood. “Role of Therapeutic Drug Monitoring of Azathioprine and Thiopurine Methyltransferase Enzyme Status in Patients With Inflammatory Bowel Disease: Indian Scenario”. International Journal of Basic & Clinical Pharmacology 9, no. 10 (September 22, 2020): 1618–1624. Accessed December 4, 2023. https://www.ijbcp.com/index.php/ijbcp/article/view/4336.