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Submitted on: 21 September 2005.
Revised on: 14 November 2005.
Accepted on: 14 December 2005.
___________________HEALTH TECHNOLOGY ASSESSMENT---NIHR JOURNALS LIBRARY
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Submitted on: 14 February 2005.
Revised on: 22 April 2005.
Accepted on: 18 May 2005.
___________________HEALTH TECHNOLOGY ASSESSMENT---NIHR JOURNALS LIBRARY
Submitted on: 02 May 2000.
Revised on: 23 June 2000.
Accepted on: 21 July 2000.
___________________HEALTH TECHNOLOGY ASSESSMENT---NIHR JOURNALS LIBRARY