Lihua, Zhang, Dong Danfeng, Jiang Cen, Wang Xuefeng, and Peng Yibing. “Clinical Characterization and Risk Factors of Clostridium Difficile Infection in Elderly Patients in a Chinese Hospital”. The Journal of Infection in Developing Countries 9, no. 04 (April 15, 2015): 381-387. Accessed August 11, 2022. https://jidc.org/index.php/journal/article/view/25881527.