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Zeng XJ, Yang GH, Liao SS, Chen AP, Tan J, Huang ZJ, Li H. Survey of coverage, strategy and cost of hepatitis B vaccination in rural and urban areas of China. World J Gastroenterol 1999; 5(4): 320-323 [PMID: 11819457 DOI: 10.3748/wjg.v5.i4.320]
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