Submitted on: 21 March 2018.
Revised on: 08 June 2018.
Accepted on: 21 June 2018.
___________________Journal of the Economics of Ageing
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Submitted on: 17 May 2003.
Revised on: 29 August 2003.
Accepted on: 15 October 2003.
___________________Journal of the Economics of Ageing
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