Submitted on: 10 September 1999.
Revised on: 07 January 2000.
Accepted on: 23 January 2000.
___________________Gomal Journal of Medical Sciences
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Submitted on: 15 January 2015.
Revised on: 20 February 2015.
Accepted on: 27 March 2015.
___________________Gomal Journal of Medical Sciences
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http://reply.papertrans.cn/2/109/10889/10889-35.png
Submitted on: 31 October 1998.
Revised on: 08 December 1998.
Accepted on: 04 January 1999.
___________________Gomal Journal of Medical Sciences