Submitted on: 24 March 2000.
Revised on: 03 May 2000.
Accepted on: 15 May 2000.
___________________CLINICAL MICROBIOLOGY AND INFECTION
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Submitted on: 05 January 2001.
Revised on: 02 April 2001.
Accepted on: 22 May 2001.
___________________CLINICAL MICROBIOLOGY AND INFECTION
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