Seroepidemiology and Carriage of Diphtheria in Epidemic-Prone Area and Implications for Vaccination Policy, Vietnam oleh Noriko Kitamura, Thanh T. Hoan, Hung M. Do, The A. Dao, Lien T. Le, Thao T.T. Le, Thuy T.T. Doan, Thuong N. Chau, Hoi T. Dinh, Masaaki Iwaki, Mitsutoshi Senoh, Androulla Efstraciou, Nen M. Ho, Duc M. Pham, Duc-Anh Dang, Michiko Toizumi, Paul Fine, Hung T. Do, Lay-Myint Yoshida