Volume 14, Issue 3, March 2013, Pages 1945-1949
Volume 13, Issue 5, May 2012, Pages 2341-2344
Volume 13, Issue 5, May 2012, Pages 2345-2348
Volume 13, Issue 3, March 2012, Pages 833-836
Volume 12, Issue 9, September 2011, Pages 2295-2297
Volume 12, Issue 9, September 2011, Pages 2299-2303