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Rohrbach LA, Howard-Pitney B, Unger JB, Dent CW, Howard KA, Cruz TB, Ribisl KM, Norman GJ, Fishbein H, Johnson CA.Rohrbach LA, et al. Among authors: unger jb.Am J Public Health. 2002 Jun;92(6):975-83. doi: 10.2105/ajph.92.6.975.Am J Public Health. 2002.PMID: 12036792Free PMC article.
Chen X, Li G, Unger JB, Liu X, Johnson CA.Chen X, et al.Am J Public Health. 2003 Dec;93(12):2099-104. doi: 10.2105/ajph.93.12.2099.Am J Public Health. 2003.PMID: 14652341Free PMC article.
Zheng H, Sussman S, Chen X, Wang Y, Xia J, Gong J, Liu C, Shan J, Unger J, Johnson CA.Zheng H, et al. Among authors: unger j.Addict Behav. 2004 Dec;29(9):1725-33. doi: 10.1016/j.addbeh.2004.03.035.Addict Behav. 2004.PMID: 15530717