Bribing a doctor $25,000 to steer patients to a pair of medical labs might cost two Monmouth marketing firm owners up to five years in prison.

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In a Camden courtroom, Daniel Gilman, 62, of Ocean Grove, and Kenneth Robberson, 46, of Wall Township, pleaded guilty to a federal charge of conspiracy to pay kickbacks, according to the office of New Jersey U.S. Attorney Paul Fishman.

In addition to prison time, they risk fines as high as $250,000, or twice the gross gain or loss resulting from the offense.

Gilman and Roberson represented a blood analysis lab and a DNA analysis lab through their firm, Promed Practice Consultants. Each received monthly commissions for referrals, equal to 10 percent of the labs' insurance and Medicare reimbursements.

The pair admitted paying the physician for referrals from March 2014 through May 2015, using money from their commission checks. Authorities said the operators of the labs were not aware of the arrangement.

Sentencing is scheduled for January 11, 2016.