Volume 15, Issue 8, August 2014, Pages 3411-3413
Volume 14, Issue 1, January 2013, Pages 97-102
Volume 13, Issue 8, August 2012, Pages 3611-3615
Volume 13, Issue 7, July 2012, Pages 3031-3035
Volume 10, Issue 1, January 2009, Pages 155-158