Wongkongkam, K., O. Thosingha, K. Utriyaprasit, B. Riegel, C. Ruangsetakit, and C. Viwatwongkasem. “Relationship Between Diabetic Duration and the Severity of Peripheral Arterial Disease Among Thai Patients With Type-2 Diabetes”. Nursing Science Journal of Thailand, vol. 29, no. 3, Sept. 2011, pp. 124-32, https://he02.tci-thaijo.org/index.php/ns/article/view/2878.