Submitted on: 23 August 2003.
Revised on: 25 October 2003.
Accepted on: 19 November 2003.
___________________EPIDEMIOLOGY AND INFECTION---CAMBRIDGE UNIV PRESS
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Submitted on: 07 December 1998.
Revised on: 10 January 1999.
Accepted on: 23 January 1999.
___________________EPIDEMIOLOGY AND INFECTION---CAMBRIDGE UNIV PRESS
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Submitted on: 12 October 2020.
Revised on: 09 December 2020.
Accepted on: 19 January 2021.
___________________EPIDEMIOLOGY AND INFECTION---CAMBRIDGE UNIV PRESS
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Submitted on: 11 February 2020.
Revised on: 26 March 2020.
Accepted on: 01 May 2020.
___________________EPIDEMIOLOGY AND INFECTION---CAMBRIDGE UNIV PRESS