Submitted on: 22 June 2001.
Revised on: 03 August 2001.
Accepted on: 22 August 2001.
Rev Rene---UNIV FEDERAL CEARA, DEPT ENFERMAGEM
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Submitted on: 24 December 1998.
Revised on: 26 January 1999.
Accepted on: 04 February 1999.
Rev Rene---UNIV FEDERAL CEARA, DEPT ENFERMAGEM