Submitted on: 10 February 2013.
Revised on: 24 March 2013.
Accepted on: 17 April 2013.
Nigerian Postgraduate Medical Journal
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http://reply.papertrans.cn/3/232/23157/23157-33.png
Submitted on: 15 October 2005.
Revised on: 12 November 2005.
Accepted on: 06 December 2005.
Nigerian Postgraduate Medical Journal
Submitted on: 25 September 2012.
Revised on: 23 October 2012.
Accepted on: 29 October 2012.
Nigerian Postgraduate Medical Journal
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