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. 2013 Sep 23;4:114. doi: 10.3389/fpsyt.2013.00114

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Copyright © 2013 Robinson, Versace, Lam, Minnix, Engelmann, Cui, Karam-Hage, Shete, Tomlinson, Chen, Wetter, Green and Cinciripini.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The significant picture category (UNP, NEU, PLE, CIG) main effect on mean LPP amplitude for 104 smokers of European ancestry. The error bars depict standard deviations. *Significantly different from NEU. ^‡Significantly different from PLE.