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Submitted on: 20 April 2009.
Revised on: 10 July 2009.
Accepted on: 16 August 2009.
___________________Frontiers in Microbiology---FRONTIERS MEDIA SA
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Submitted on: 24 April 2006.
Revised on: 05 August 2006.
Accepted on: 19 August 2006.
___________________Frontiers in Microbiology---FRONTIERS MEDIA SA
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Submitted on: 10 February 2003.
Revised on: 09 March 2003.
Accepted on: 04 April 2003.
___________________Frontiers in Microbiology---FRONTIERS MEDIA SA
Submitted on: 10 August 2012.
Revised on: 23 October 2012.
Accepted on: 24 November 2012.
___________________Frontiers in Microbiology---FRONTIERS MEDIA SA