No abstract available
MeSH terms
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Adult
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Age Factors
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California
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Female
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Group Practice
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Health Services / statistics & numerical data*
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Hospitalization
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Hospitals / statistics & numerical data
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Humans
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Insurance, Health
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Male
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Middle Aged
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Multiphasic Screening
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Physical Examination
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Physicians / statistics & numerical data
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Sampling Studies
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Sex Factors
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Smoking*
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Social Class
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Time Factors