Evolution and spatio-temporal dynamics of Enterovirus A71 subgenogroups in Vietnam by Thao, N, Donato, C, Trang, V, Kien, N, Trang, P, Khanh, T, Nguyet, D, Sessions, O, Cuong, H, Lan, P, Huong, V, van Doorn, H, Dhanasekaran, V