Le, Mai Thi Quynh, Phuong Mai Hoang Vu, Hang Khanh Le Nguyen, Thach Co Nguyen, and Phuong Thi Kim Nguyen. “ 2009–2012”. Western Pacific Surveillance and Response 4, no. 2 (June 26, 2013). Accessed November 22, 2024. https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/94.