Submitted on: 15 May 2008.
Revised on: 07 September 2008.
Accepted on: 20 October 2008.
___________________DEMOGRAPHY---DUKE UNIV PRESS
Submitted on: 15 April 2015.
Revised on: 13 June 2015.
Accepted on: 27 July 2015.
___________________DEMOGRAPHY---DUKE UNIV PRESS
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Submitted on: 03 May 2007.
Revised on: 17 July 2007.
Accepted on: 06 September 2007.
___________________DEMOGRAPHY---DUKE UNIV PRESS
Submitted on: 01 November 2009.
Revised on: 31 January 2010.
Accepted on: 18 March 2010.
___________________DEMOGRAPHY---DUKE UNIV PRESS
Submitted on: 16 November 2017.
Revised on: 23 January 2018.
Accepted on: 11 February 2018.
___________________DEMOGRAPHY---DUKE UNIV PRESS
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Submitted on: 19 May 2007.
Revised on: 24 June 2007.
Accepted on: 22 August 2007.
___________________DEMOGRAPHY---DUKE UNIV PRESS