Submitted on: 24 May 2002.
Revised on: 18 June 2002.
Accepted on: 08 July 2002.
Lancet Microbe
Submitted on: 10 January 1998.
Revised on: 22 February 1998.
Accepted on: 18 March 1998.
Lancet Microbe---ELSEVIER
Submitted on: 15 February 2001.
Revised on: 09 March 2001.
Accepted on: 30 March 2001.
Lancet Microbe
Submitted on: 11 April 2008.
Revised on: 09 May 2008.
Accepted on: 16 May 2008.
Lancet Microbe
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