Evaluation of an ad hoc paper-based syndromic surveillance system in Ibaraki evacuation centres following the 2011 Great East Japan Earthquake and Tsunami. Western Pac Surveill Response J [Internet]. 2018 Dec. 20 [cited 2026 Apr. 4];9(4). Available from: https://ojs-dev.wpro.who.int/ojs/index.php/wpsar/article/view/566