US FDA, December 14, 2012 approval letter –Fluarix Quadrivalent.
US FDA Product Approval : vaccine index (food and drug administration)
질병관리청_긴급상황_인플루엔자 [https://www.kdca.go.kr/contents.es?mid=a21106050000][Accessed date : Feb 25, 2022]
질병관리청_감염병포털_인플루엔자바이러스감염증
https://www.kdca.go.kr/npt/biz/npp/portal/nppSumryMain.do?icdCd=ND0710&icdgrpCd=04&icdSubgrpCd=ND0007 [Accessed date : Feb 25, 2022]