Submitted on: 11 January 2001.
Revised on: 28 April 2001.
Accepted on: 25 May 2001.
___________________Contemporary Clinical Trials---ELSEVIER SCIENCE INC
Submitted on: 07 August 2013.
Revised on: 28 September 2013.
Accepted on: 17 October 2013.
___________________Contemporary Clinical Trials---ELSEVIER SCIENCE INC
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Submitted on: 14 August 2012.
Revised on: 13 September 2012.
Accepted on: 01 November 2012.
___________________Contemporary Clinical Trials---ELSEVIER SCIENCE INC
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Submitted on: 20 March 2008.
Revised on: 15 July 2008.
Accepted on: 03 September 2008.
___________________Contemporary Clinical Trials---ELSEVIER SCIENCE INC
Submitted on: 08 April 2000.
Revised on: 27 July 2000.
Accepted on: 13 August 2000.
___________________Contemporary Clinical Trials---ELSEVIER SCIENCE INC