Submitted on: 19 January 2006.
Revised on: 10 May 2006.
Accepted on: 29 May 2006.
___________________Epidemiologia & Prevenzione---INFERENZE SCARL
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Submitted on: 13 May 2013.
Revised on: 18 June 2013.
Accepted on: 21 July 2013.
___________________Epidemiologia & Prevenzione---INFERENZE SCARL
Submitted on: 07 December 2002.
Revised on: 18 January 2003.
Accepted on: 15 March 2003.
___________________Epidemiologia & Prevenzione---INFERENZE SCARL
Submitted on: 20 December 2018.
Revised on: 31 March 2019.
Accepted on: 24 April 2019.
___________________Epidemiologia & Prevenzione---INFERENZE SCARL
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Submitted on: 05 August 2012.
Revised on: 29 August 2012.
Accepted on: 10 September 2012.
___________________Epidemiologia & Prevenzione---INFERENZE SCARL
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Submitted on: 14 May 2005.
Revised on: 01 July 2005.
Accepted on: 11 August 2005.
___________________Epidemiologia & Prevenzione---INFERENZE SCARL