Two proxy advisory firms have recommended that Express Scripts' and Cigna's shareholders vote in favor of their pending $54 billion merger. Institutional Shareholder Services Inc. recommended shareholders vote for the deal at a special meeting set for Aug. 24, saying in a report last week, "Cigna expects ESRX to improve its ability to control pharmaceutical costs and to hold down overall medical costs, through integrating data from patients' prescriptions and other medical care. That greater ability...