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Submitted on: 28 June 2001.
Revised on: 29 August 2001.
Accepted on: 11 October 2001.
___________________Biologics-Targets & Therapy---DOVE MEDICAL PRESS LTD
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Submitted on: 18 November 2004.
Revised on: 06 February 2005.
Accepted on: 17 March 2005.
___________________Biologics-Targets & Therapy---DOVE MEDICAL PRESS LTD
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