Volume 12, Issue 6, June 2011, Pages 1473-1476
Volume 12, Issue 4, April 2011, Pages 901-907
Volume 10, Issue 6, June 2009, Pages 1151-1158
Volume 10, Issue 3, March 2009, Pages 501-506
Volume 9, Issue 4, April 2008, Pages 663-670
Volume 8, Issue 4, April 2007, Pages 530-534
Volume 8, Issue 3, March 2007, Pages 363-366