Volume 14, Issue 5, May 2013, Pages 3309-3314
Volume 13, Issue 4, April 2012, Pages 1599-1603
Volume 12, Issue 10, October 2011, Pages 2773-2778
Volume 12, Issue 1, January 2011, Pages 67-72
Volume 11, Issue 2, February 2010, Pages 339-342
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