Ohkusa, Yasushi, Yoshinori Yasui, Tamie Sugawara, Nobuhiko Okabe, Kiyosu Taniguchi, and Kazunori Oishi. 2013. “Estimation of Influenza Incidence by Age in the 2011 12 Seasons in Japan Using SASSy”. Online Journal of Public Health Informatics 5 (1). https://doi.org/10.5210/ojphi.v5i1.4492.