Baseline information regarding study sites, sample size and methods, Henan, Hubei and Shandong provinces, China, 2011.
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*Hospitals are divided into three levels according to their functions (specialties) and technical capacities. Tertiary hospitals are the highest level.Baseline information regarding study sites, sample size and methods, Henan, Hubei and Shandong provinces, China, 2011.
创建时间：
2015-12-02
