Volume 13, Issue 9, September 2012, Pages 4777-4781
Volume 13, Issue 5, May 2012, Pages 2153-2155
Volume 13, Issue 4, April 2012, Pages 1483-1486
Volume 8, Issue 4, April 2007, Pages 593-596
Volume 7, Issue 4, April 2006, Pages 575-581
Volume 6, Issue 1, January 2005, Pages 33-36