How do I get medical providers to remove paid debt from credit bureau due to a work injury?

My work comp bills are all paid the case took 6 yrs. Many of the medical bills went into collections that still show up on my credit report. This has lowered my credit score tremendously. How do I get these paid collections removed from my report? According to the 3 credit bureaus, it must be [...] http://bit.ly/q2h379