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Submitted on: 31 October 2004.
Revised on: 23 November 2004.
Accepted on: 04 December 2004.
Trials
Submitted on: 13 July 2002.
Revised on: 16 August 2002.
Accepted on: 21 August 2002.
Trials
Submitted on: 12 March 2008.
Revised on: 25 April 2008.
Accepted on: 07 May 2008.
Trials---BMC
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Submitted on: 29 November 2006.
Revised on: 13 December 2006.
Accepted on: 26 December 2006.
Trials---BMC