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Submitted on: 23 August 2024.
Revised on: 21 December 2024.
Accepted on: 18 January 2025.
___________________DEMOGRAPHY---DUKE UNIV PRESS
Submitted on: 06 February 2015.
Revised on: 07 April 2015.
Accepted on: 31 May 2015.
___________________DEMOGRAPHY---DUKE UNIV PRESS
Submitted on: 06 August 1999.
Revised on: 15 September 1999.
Accepted on: 29 October 1999.
___________________DEMOGRAPHY---DUKE UNIV PRESS
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