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AUTHOR MANUSCRIPT. © Elsevier (2013): This is the author’s version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. Some changes resulting from the publishing process, such as editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Some changes may have been made to this work since being accepted for publication. A definitive version was subsequently published in Internationa