Mongkol, Sarayoot, and Jatuporn Wongsathikul. “A Comparison of Six-Minute Walk Distance Between COPD Patients With and Without Anemia”. Journal of Associated Medical Sciences 48, no. 1 (January 1, 2015): 67. Accessed May 17, 2024. https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/59945.