Volume 15, Issue 15, December 2014, Pages 5999-6003
Volume 13, Issue 6, June 2012, Pages 2429-2435
Volume 11, Issue 1, January 2010, Pages 13-14
Volume 10, Issue 6, June 2009, Pages 975-980
Volume 10, Issue 2, February 2009, Pages 299-302
Volume 8, Issue 1, January 2007, Pages 13-23
Volume 3, Issue 1, January 2002, Pages 55-60
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