Wongtiraporn, Wanida, Nisarat Opartkiattikul, and Panutsaya Tientadakul. “The Value of Local ISI Calibration in Correcting the Variability in INR Determination”. Siriraj Medical Journal 55, no. 7 (July 1, 2003): 381–384. Accessed April 25, 2024. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245416.