Submitted on: 07 February 1998.
Revised on: 14 March 1998.
Accepted on: 25 April 1998.
___________________Injury Epidemiology---BMC
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Submitted on: 13 November 1999.
Revised on: 03 March 2000.
Accepted on: 08 April 2000.
___________________Injury Epidemiology---BMC
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Submitted on: 14 April 2005.
Revised on: 10 July 2005.
Accepted on: 24 August 2005.
___________________Injury Epidemiology---BMC