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Submitted on: 03 September 2000.
Revised on: 10 November 2000.
Accepted on: 29 November 2000.
___________________HUMAN DEVELOPMENT---KARGER
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Submitted on: 19 January 2007.
Revised on: 12 March 2007.
Accepted on: 08 April 2007.
___________________HUMAN DEVELOPMENT---KARGER
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