Submitted on: 01 November 2012.
Revised on: 02 January 2013.
Accepted on: 16 January 2013.
___________________EVOLUTION---OXFORD UNIV PRESS
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Submitted on: 03 June 2014.
Revised on: 04 August 2014.
Accepted on: 24 August 2014.
___________________EVOLUTION---OXFORD UNIV PRESS
Submitted on: 18 April 2003.
Revised on: 05 June 2003.
Accepted on: 29 July 2003.
___________________EVOLUTION---OXFORD UNIV PRESS
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