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Submitted on: 16 September 1999.
Revised on: 30 December 1999.
Accepted on: 10 January 2000.
___________________Antimicrobial Resistance and Infection Control
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Submitted on: 15 February 2009.
Revised on: 09 April 2009.
Accepted on: 19 May 2009.
___________________Antimicrobial Resistance and Infection Control
Submitted on: 23 October 2009.
Revised on: 20 November 2009.
Accepted on: 30 December 2009.
___________________Antimicrobial Resistance and Infection Control