Submitted on: 21 December 2006.
Revised on: 09 March 2007.
Accepted on: 18 April 2007.
___________________JOURNAL OF THE EGYPTIAN PUBLIC HEALTH ASSOCIATION
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Submitted on: 08 April 2000.
Revised on: 11 July 2000.
Accepted on: 23 August 2000.
___________________JOURNAL OF THE EGYPTIAN PUBLIC HEALTH ASSOCIATION
Submitted on: 27 November 2015.
Revised on: 10 January 2016.
Accepted on: 23 February 2016.
___________________JOURNAL OF THE EGYPTIAN PUBLIC HEALTH ASSOCIATION
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Submitted on: 28 August 2013.
Revised on: 02 October 2013.
Accepted on: 15 November 2013.
___________________JOURNAL OF THE EGYPTIAN PUBLIC HEALTH ASSOCIATION
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