In this video, health care analysts David Williamson and Max Macaluso discuss some of the biggest movers at the end of last week. We have upgrades, downgrades, and clinical trial action impacting several popular stocks. Watch and find out why these stocks moved and what it means for investors.

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Editor's note: Novartis' Sandostatin fourth-quarter sales of $374 million are misstated as its full year sales, instead of $1.4 billion. The Fool regrets the error.