Ethnic variation in peer influences on adolescent smoking.
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J. Unger | C. A. Johnson | T. Cruz | L. Rohrbach | L. Baezconde-Garbanati | K. Howard | P. Palmer | C. Johnson
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J. Unger | C. A. Johnson | T. Cruz | L. Rohrbach | L. Baezconde-Garbanati | K. Howard | P. Palmer | C. Johnson