Hepatitis B immunisation leads to the decline of hepatitis B virus prevalence in Gansu province, China


Correspondence to: Professor Kedi Yang, Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, P.R. China; e-mail: cj_514@163.com

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