The $67 billion Cigna-Express Scripts merger just passed a key hurdle (CI, ESRX)

Cigna and Express Scripts shareholders have voted to approve the companies' $67 billion merger. 
The deal combines a health insurer and a company that helps negotiate lower prices for prescription drugs in the form of rebates on behalf of health plans.
The deal was in jeopardy for a week after billionaire Carl Icahn came out against the deal, saying it "may well rival the worst acquisitions in corporate history." He ultimately reversed his course.
The deal now awaits the scrutiny