Submitted on: 25 April 2015.
Revised on: 05 May 2015.
Accepted on: 27 May 2015.
Revista de Epidemiologia e Controle de Infeccao
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Submitted on: 30 June 2008.
Revised on: 12 August 2008.
Accepted on: 24 August 2008.
NULL
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