http://reply.papertrans.cn/3/241/24022/24022-31.png
http://reply.papertrans.cn/3/241/24022/24022-32.png
Submitted on: 10 July 2014.
Revised on: 19 August 2014.
Accepted on: 02 September 2014.
Pan African Medical Journal---AFRICAN FIELD EPIDEMIOLOGY NETWORK-AFENET
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Submitted on: 21 September 2012.
Revised on: 27 October 2012.
Accepted on: 12 November 2012.
Pan African Medical Journal---AFRICAN FIELD EPIDEMIOLOGY NETWORK-AFENET
Submitted on: 21 May 2014.
Revised on: 11 June 2014.
Accepted on: 17 June 2014.
Pan African Medical Journal