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Submitted on: 02 November 2006.
Revised on: 01 January 2007.
Accepted on: 01 February 2007.
___________________Health Economics Review---BMC
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Submitted on: 15 February 2014.
Revised on: 09 April 2014.
Accepted on: 03 June 2014.
___________________Health Economics Review---BMC
Submitted on: 04 September 2013.
Revised on: 28 October 2013.
Accepted on: 05 December 2013.
___________________Health Economics Review---BMC
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