The country's five largest health insurers are now down to three, or will be, if regulators allow the deal to go through. Aetna (AET) bought Humana (HUM) for $37 billion of cash and stock, giving Aetna a larger slice of the growing Medicare Advantage market. Anthem (ANTM) bought Cigna (CI) for $54 billion, creating the country's largest insurer by individuals covered. Whether or not the deals go through is critical to investment strategy. See what our anaylst recommends.

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