Submitted on: 16 May 2000.
Revised on: 19 July 2000.
Accepted on: 04 August 2000.
___________________International Journal of Antimicrobial Agents
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Submitted on: 22 October 2005.
Revised on: 06 February 2006.
Accepted on: 04 April 2006.
___________________International Journal of Antimicrobial Agents
Submitted on: 24 December 2006.
Revised on: 07 April 2007.
Accepted on: 28 May 2007.
___________________International Journal of Antimicrobial Agents
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