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Emmons KM, Wong M, Hammond SK, Velicer WF, Fava JL, Monroe AD, Evans JL.Emmons KM, et al. Among authors: velicer wf.Prev Med. 2001 Apr;32(4):321-31. doi: 10.1006/pmed.2000.0822.Prev Med. 2001.PMID: 11304093Review.