Chaowarat, K., S. Sindhubodee, V. Choonhaklai, V. Chittchang, S. Pumpaisanchai, N. Wongwattanasatien, T. Thaidumrong, C. Kosrisirikul, and M. Huabkong. “Incidence and Risk Factors Associated With Retrorenal Colon”. Insight Urology, vol. 39, no. 2, Dec. 2018, pp. 20-27, https://he02.tci-thaijo.org/index.php/TJU/article/view/114996.