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Er, Vanessa, Rona Campbell, Matthew Hickman, Chris Bonell, Laurence Moore, und James White. "The Relative Importance of Perceived Substance Misuse Use By Different Peers On Smoking, Alcohol and Illicit Drug Use in Adolescence." Drug Alcohol Depend 2019.

Er, Vanessa, et al. "The Relative Importance of Perceived Substance Misuse Use By Different Peers On Smoking, Alcohol and Illicit Drug Use in Adolescence." Drug Alcohol Depend 2019.