Showing 1 - 14 results of 14 for search 'BASIC SAMPLING', query time: 0.78s Refine Results
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    ... adults in Hebei Province, central China. Using a multi-stage stratified cluster sampling method, 6,552...
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    ... people in China. Methods: The cross-sectional study samples (n = 5,327) were from the China National...
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    ... migrants or farmers aged 20–80 years, recruited by using a stratified cluster sampling method from...
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    .... Participants and Measurements: The questionnaire was administered to a sample of 3959 Chinese adults. Results...
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    .... General clinical information, serum samples were obtained from all subjects and serum ZAG levels were...
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