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Submitted on: 27 April 2001.
Revised on: 25 July 2001.
Accepted on: 12 August 2001.
___________________BMC Medical Ethics---BMC
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Submitted on: 30 March 2003.
Revised on: 01 May 2003.
Accepted on: 10 June 2003.
___________________BMC Medical Ethics---BMC
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Submitted on: 04 June 2001.
Revised on: 27 August 2001.
Accepted on: 07 September 2001.
___________________BMC Medical Ethics---BMC
Submitted on: 20 November 1999.
Revised on: 31 January 2000.
Accepted on: 23 March 2000.
___________________BMC Medical Ethics---BMC
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