| http://www.w3.org/ns/prov#value | - doi:10.1371/journal.pone.0003877Editor: Jose M. Belizan, Institute of Clinical Effectiveness and Health Policy, ArgentinaReceived: June 27, 2008; Accepted: November 10, 2008; Published: December 9, 2008This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduc
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