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Submitted on: 05 October 1999.
Revised on: 14 January 2000.
Accepted on: 07 February 2000.
___________________BMC Palliative Care---BMC
Submitted on: 24 December 2009.
Revised on: 27 March 2010.
Accepted on: 15 May 2010.
___________________BMC Palliative Care---BMC
Submitted on: 29 September 2014.
Revised on: 07 January 2015.
Accepted on: 18 January 2015.
___________________BMC Palliative Care---BMC
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