Submitted on: 16 March 2006.
Revised on: 26 June 2006.
Accepted on: 15 July 2006.
___________________Journal of Natural Medicines---SPRINGER JAPAN KK
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Submitted on: 16 November 2007.
Revised on: 03 January 2008.
Accepted on: 16 January 2008.
___________________Journal of Natural Medicines---SPRINGER JAPAN KK
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Submitted on: 23 May 2002.
Revised on: 01 July 2002.
Accepted on: 20 August 2002.
___________________Journal of Natural Medicines---SPRINGER JAPAN KK