T.- sum Lam, M.- ting Yuk, N.- chong Tsang, M.- ha Wong, and S.- kwan Chuang, “Clostridium difficile infection outbreak in a male rehabilitation ward, Hong Kong (China), 2011”, Western Pac Surveill Response J, vol. 3, no. 4, May 2013, doi: 10.5365/wpsar.2012.3.4.001.