Seven UnitedHealth Group shareholders are calling on the health care conglomerate to produce a report on how often its policies lead to denied or delayed care, and the effects on patients and the economy. The proposal, which could go up for a vote by UnitedHealth's investors at the company's annual meeting later this year, comes as the company is under tremendous public scrutiny for tactics such as prior authorization and care denials. The killing of the CEO of UnitedHealth's health insurance business in early December ignited a firestorm of anger — not against the alleged killer, but against health insurers like UnitedHealth who many blame for the industry's dysfunction.