Questcor (UNKNOWN:QCOR.DL) is one of the most shorted health-care stocks on the market. Despite the company's profitability and strong cash flow, shares have taken a big hit as concerns arose regarding its top selling drug, Acthar. In this video, Motley Fool health-care analyst David Williamson reviews the bear case against Questcor and whether they are likely right in their assumptions.
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