Submitted on: 07 September 1998.
Revised on: 20 November 1998.
Accepted on: 21 December 1998.
___________________European Journal of Paediatric Dentistry
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Submitted on: 06 November 2013.
Revised on: 10 February 2014.
Accepted on: 21 March 2014.
___________________European Journal of Paediatric Dentistry
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Submitted on: 12 August 2006.
Revised on: 05 October 2006.
Accepted on: 27 October 2006.
___________________European Journal of Paediatric Dentistry
Submitted on: 06 December 2000.
Revised on: 24 January 2001.
Accepted on: 24 March 2001.
___________________European Journal of Paediatric Dentistry
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