Submitted on: 19 June 1999.
Revised on: 10 July 1999.
Accepted on: 31 August 1999.
___________________Clinical Epidemiology---DOVE MEDICAL PRESS LTD
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Submitted on: 13 September 1999.
Revised on: 10 December 1999.
Accepted on: 21 December 1999.
___________________Clinical Epidemiology---DOVE MEDICAL PRESS LTD
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Submitted on: 07 March 2024.
Revised on: 30 March 2024.
Accepted on: 06 May 2024.
___________________Clinical Epidemiology---DOVE MEDICAL PRESS LTD
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