"Often led by doctors with the veneer of noble concern for patients, physician-staffing firms -- third-party companies that employ doctors and assign them out to health care facilities -- have opposed efforts to limit the practice known as balance billing.... But as lobbyists purporting to represent doctors and hospitals fight the proposals, it has become increasingly clear that the force behind the multimillion-dollar crusade is not only medical professionals, but also investors in private equity and venture capital firms."  MORE >>