Submitted on: 27 February 1999.
Revised on: 25 June 1999.
Accepted on: 12 August 1999.
___________________ANNALS OF EPIDEMIOLOGY---ELSEVIER SCIENCE INC
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Submitted on: 07 May 2014.
Revised on: 17 June 2014.
Accepted on: 19 July 2014.
___________________ANNALS OF EPIDEMIOLOGY---ELSEVIER SCIENCE INC
Submitted on: 29 March 2007.
Revised on: 22 June 2007.
Accepted on: 10 July 2007.
___________________ANNALS OF EPIDEMIOLOGY---ELSEVIER SCIENCE INC
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Submitted on: 05 February 2006.
Revised on: 02 May 2006.
Accepted on: 06 June 2006.
___________________ANNALS OF EPIDEMIOLOGY---ELSEVIER SCIENCE INC