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http://reply.papertrans.cn/2/105/10470/10470-32.png
Submitted on: 23 March 2012.
Revised on: 08 June 2012.
Accepted on: 25 July 2012.
___________________Genes and Environment---BMC
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Submitted on: 30 March 1998.
Revised on: 03 June 1998.
Accepted on: 30 July 1998.
___________________Genes and Environment---BMC
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