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Submitted on: 20 July 1998.
Revised on: 25 September 1998.
Accepted on: 13 November 1998.
___________________Antimicrobial Resistance and Infection Control
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Submitted on: 15 September 2018.
Revised on: 10 January 2019.
Accepted on: 13 February 2019.
___________________Antimicrobial Resistance and Infection Control
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