Volume 13, Issue 10, October 2012, Pages 4867-4871
Volume 13, Issue 8, August 2012, Pages 3713-3716
Volume 13, Issue 6, June 2012, Pages 2739-2744
Volume 12, Issue 11, November 2011, Pages 2985-2990
Volume 12, Issue 5, May 2011, Pages 1269-1273
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