Volume 16, Issue 4, April 2015, Pages 1403-1407
Volume 15, Issue 20, December 2014, Pages 8843-8846
Volume 13, Issue 11, November 2012, Pages 5735-5739
Volume 13, Issue 9, September 2012, Pages 4745-4749
Volume 13, Issue 7, July 2012, Pages 3025-3029
Volume 10, Issue 4, April 2009, Pages 707-710
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