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Submitted on: 08 June 1999.
Revised on: 04 July 1999.
Accepted on: 13 July 1999.
PHARMACEUTICAL RESEARCH---SPRINGER/PLENUM PUBLISHERS
Submitted on: 12 November 1998.
Revised on: 20 December 1998.
Accepted on: 04 January 1999.
PHARMACEUTICAL RESEARCH
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