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Submitted on: 17 July 2001.
Revised on: 12 October 2001.
Accepted on: 30 October 2001.
___________________BIOMEDICAL PAPERS-OLOMOUC---PALACKY UNIV, MEDICAL FAC
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Submitted on: 18 January 2008.
Revised on: 09 April 2008.
Accepted on: 13 May 2008.
___________________BIOMEDICAL PAPERS-OLOMOUC---PALACKY UNIV, MEDICAL FAC