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Submitted on: 08 June 2007.
Revised on: 02 October 2007.
Accepted on: 16 October 2007.
___________________INTERNATIONAL JOURNAL OF RISK & SAFETY IN MEDICINE
Submitted on: 19 May 1999.
Revised on: 09 July 1999.
Accepted on: 13 August 1999.
___________________INTERNATIONAL JOURNAL OF RISK & SAFETY IN MEDICINE