Submitted on: 04 November 2001.
Revised on: 28 January 2002.
Accepted on: 18 March 2002.
___________________Canadian Studies in Population
Submitted on: 10 November 2015.
Revised on: 04 February 2016.
Accepted on: 09 March 2016.
___________________Canadian Studies in Population
Submitted on: 30 September 2018.
Revised on: 20 January 2019.
Accepted on: 26 February 2019.
___________________Canadian Studies in Population
Submitted on: 04 August 2010.
Revised on: 29 October 2010.
Accepted on: 03 December 2010.
___________________Canadian Studies in Population
http://reply.papertrans.cn/1/47/4654/4654-35.png
Submitted on: 24 January 1998.
Revised on: 15 May 1998.
Accepted on: 09 June 1998.
___________________Canadian Studies in Population