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Submitted on: 07 February 2002.
Revised on: 21 April 2002.
Accepted on: 22 May 2002.
___________________JOURNAL OF DRUG TARGETING---TAYLOR & FRANCIS LTD
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Submitted on: 02 June 1999.
Revised on: 19 September 1999.
Accepted on: 07 November 1999.
___________________JOURNAL OF DRUG TARGETING---TAYLOR & FRANCIS LTD