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Market meld: DaVita's deal with a large physician-management group shows the lines are no longer clear in healthcare.

In the rapidly shifting healthcare landscape, some unusual partnerships are being formed, such as the merger announcement of DaVita with a large physician-management group. "We think that by combining with HealthCare Partners the data becomes ever more compelling that all of America's dialysis patients need to be taken care of on an integrated bundled basis," says DaVita's Kent Thiry.