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http://reply.papertrans.cn/1/40/3914/3914-32.png
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Submitted on: 22 October 2000.
Revised on: 25 January 2001.
Accepted on: 11 March 2001.
___________________BMC Nutrition---BMC
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Submitted on: 10 March 2008.
Revised on: 22 May 2008.
Accepted on: 17 June 2008.
___________________BMC Nutrition---BMC