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Submitted on: 25 April 2004.
Revised on: 10 June 2004.
Accepted on: 30 July 2004.
___________________JOURNAL OF MEDICAL ECONOMICS---TAYLOR & FRANCIS LTD
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Submitted on: 13 May 2014.
Revised on: 21 August 2014.
Accepted on: 17 September 2014.
___________________JOURNAL OF MEDICAL ECONOMICS---TAYLOR & FRANCIS LTD