Public disclosures about financial ties between doctors and industry can be imprecise -- to put it mildly.Take Thomas Zdeblick, a prominent spine surgeon and researcher at the University of Wisconsin, who told the university in each of the five years he received payments from Medtronic that he'd received $20,000 or more from the company. One year, he reported getting $40,000 or more.How much more? Over five years Zdeblick received $19 million in payments from Medtronic to help develop and promote products for the spine, the WSJ reports this morning. It's the latest example to come out of Sen. Charles Grassley's probe...