Submitted on: 30 November 1998.
Revised on: 29 January 1999.
Accepted on: 10 February 1999.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
Submitted on: 19 March 2011.
Revised on: 10 April 2011.
Accepted on: 25 May 2011.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
Submitted on: 11 January 2000.
Revised on: 10 April 2000.
Accepted on: 27 April 2000.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
Submitted on: 09 February 2004.
Revised on: 16 April 2004.
Accepted on: 14 June 2004.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
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Submitted on: 25 February 2013.
Revised on: 27 May 2013.
Accepted on: 09 June 2013.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
Submitted on: 12 March 2002.
Revised on: 17 May 2002.
Accepted on: 09 June 2002.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
Submitted on: 30 October 1998.
Revised on: 02 January 1999.
Accepted on: 13 January 1999.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS
Submitted on: 08 April 2010.
Revised on: 22 May 2010.
Accepted on: 25 June 2010.
___________________JOURNAL OF BIOSOCIAL SCIENCE---CAMBRIDGE UNIV PRESS