Plans for nationwide serosurveillance network in Vietnam by Anh, DD, Choisy, M, Clapham, HE, Cuong, HQ, Dung, VTV, Duong, TN, Hang, NLK, Ha, HTT, Hien, NT, Hoa, TTN, Hung, TTM, Huong, VTL, Huyen, DTT, Khanh, NC, Lewycka, SO, Linley, E, Mai, LTQ, Nadjm, B, Nghia, ND, Pebody, R, Phuong, HVM, Tan, LM, Le Van Tan, Thai, PQ, Thanh, LV, Le Thanh, NT, Thuy, NTT, Thuong, NT, Thanh, LT, Thao, NTT, Tuan, NA, Uyen, PTN, Van Doorn, H