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Hagger MS, Leaver E, Esser K, Leung CM, Te Pas N, Keatley DA, Chan DK, Chatzisarantis NL.Hagger MS, et al.Ann Behav Med. 2013 Dec;46(3):394-400. doi: 10.1007/s12160-013-9520-8.Ann Behav Med. 2013.PMID: 23720186Clinical Trial.