Psychological Medicine

  • Psychological Medicine / Volume 42 / Issue 10 / October 2012, pp 2057-2069
  • Copyright © Cambridge University Press 2012 The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.
  • DOI: http://dx.doi.org/10.1017/S0033291712000402 (About DOI), Published online: 15 March 2012
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