Subjects: MENTAL illness risk factors; CROSS-sectional method; SURVEYSUNITED States; MEXICO
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Subjects: CHI-squared test; COMPARATIVE studies; MENTAL depressionCALIFORNIA; MEXICO
Subjects: HIV prevention; SUBSTANCE abuse treatment; INTRAVENOUS drug abuseMEXICO; UNITED States
Subjects: UNDOCUMENTED immigrants; ANALYSIS of variance; MENTAL depressionUNITED States; MEXICO