No abstract available
Publication types
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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Adolescent
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Adolescent Behavior
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Attitude to Health
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El Salvador
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Female
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Humans
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Interpersonal Relations*
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Life Tables*
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Peer Group*
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Peru
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Sexual Behavior / statistics & numerical data*
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Sexual Partners*
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Socioeconomic Factors
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Spain
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Surveys and Questionnaires