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Submitted on: 31 January 2007.
Revised on: 10 March 2007.
Accepted on: 30 March 2007.
Reproductive Biology and Endocrinology
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Submitted on: 15 June 2002.
Revised on: 26 June 2002.
Accepted on: 12 July 2002.
Reproductive Biology and Endocrinology
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