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Submitted on: 27 October 2000.
Revised on: 22 February 2001.
Accepted on: 09 March 2001.
___________________Acta Cirurgica Brasileira---ACTA CIRURGICA BRASILEIRA
Submitted on: 27 August 2017.
Revised on: 09 December 2017.
Accepted on: 09 January 2018.
___________________Acta Cirurgica Brasileira---ACTA CIRURGICA BRASILEIRA