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Cardinal Health (CAH) is under pressure after its competitor McKesson (MCK) slashed its profit outlook for fiscal 2017.
McKesson's disappointing earnings report ignited a selloff in health care stocks, and Jim Cramer says investors are questioning the sector's future.
Here are Friday's top research calls, including upgrades for AK Steel, ServiceNow, Qualcomm and Twitter, and downgrades for McKesson, Mead Johnson and GNC.