Submitted on: 10 July 2005.
Revised on: 01 November 2005.
Accepted on: 13 November 2005.
___________________ERNAHRUNGS UMSCHAU---UMSCHAU VERLAG
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Submitted on: 29 November 2006.
Revised on: 26 December 2006.
Accepted on: 10 January 2007.
___________________ERNAHRUNGS UMSCHAU---UMSCHAU VERLAG
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Submitted on: 23 June 2005.
Revised on: 05 October 2005.
Accepted on: 31 October 2005.
___________________ERNAHRUNGS UMSCHAU---UMSCHAU VERLAG