Submitted on: 15 August 1998.
Revised on: 26 November 1998.
Accepted on: 25 December 1998.
___________________BEHAVIOR GENETICS---SPRINGER
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Submitted on: 06 February 2003.
Revised on: 12 April 2003.
Accepted on: 11 May 2003.
___________________BEHAVIOR GENETICS---SPRINGER
Submitted on: 17 December 2008.
Revised on: 14 March 2009.
Accepted on: 27 March 2009.
___________________BEHAVIOR GENETICS---SPRINGER
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