4 results on '"Ding, Yaxing"'
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2. The impact of supplementary immunization activities on the epidemiology of measles in Tianjin, China
3. Risk factors for measles among adults in Tianjin, China: Who should be controls in a case-control study?
4. Timely measles vaccination in Tianjin, China: a cross-sectional study of immunization records and mothers
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