Page "Undisputed Champion" Paragraph 5
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The World Boxing Organization ( WBO ), established in Puerto Rico in 1988, took longer to acquire credibility.
By 2001, the WBA was giving the same recognition to WBO champions as to WBA, WBC and IBF champions.
In 2004 the WBC began naming WBO champions on its ranking listings.
The IBF did not recognise the WBO in May 2006, but was doing so by February 2007.
Conversely, the WBO explicitly recognises the other three sanctioning bodies.
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