Epidemiology and Infection

  • Epidemiology and Infection / Volume 141 / Issue 08 / August 2013, pp 1697-1704
  • 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/S0950268812002257 (About DOI), Published online: 19 October 2012
  • OPEN ACCESS
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