http://reply.papertrans.cn/3/284/28386/28386-21.png
Submitted on: 03 August 2006.
Revised on: 16 September 2006.
Accepted on: 02 October 2006.
South African Journal of Child Health
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http://reply.papertrans.cn/3/284/28386/28386-24.png
http://reply.papertrans.cn/3/284/28386/28386-25.png
Submitted on: 21 July 2006.
Revised on: 02 August 2006.
Accepted on: 14 August 2006.
South African Journal of Child Health
Submitted on: 25 July 2010.
Revised on: 18 August 2010.
Accepted on: 03 September 2010.
South African Journal of Child Health
http://reply.papertrans.cn/3/284/28386/28386-28.png
http://reply.papertrans.cn/3/284/28386/28386-29.png
Submitted on: 26 April 1998.
Revised on: 09 June 1998.
Accepted on: 18 June 1998.
South African Journal of Child Health