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Submitted on: 21 June 2005.
Revised on: 18 October 2005.
Accepted on: 13 December 2005.
___________________Cirugia y Cirujanos---MEXICAN ACAD SURGERY
Submitted on: 15 May 2019.
Revised on: 20 July 2019.
Accepted on: 14 September 2019.
___________________Cirugia y Cirujanos---MEXICAN ACAD SURGERY
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