Federal investigators allege that Jeffrey Wang, chief spine surgeon at the University of California, Los Angeles, did not inform the school about the $459,500 in royalties and other payments he received from surgical-device makers between 2004 and 2007. Sen. Charles Grassley, R-Iowa, who is among several lawmakers criticizing certain schools for their inadequate conflict-of-interest policies, sent the findings in a letter to the school's chancellor. Wang and the university declined to comment on the letter.

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