In early December, 60 Minutes aired a segment called "Hospitals: The Cost of Admission." It relentlessly went after Health Management Associates over its admissions practices, so it shouldn't be completely surprising that when the company previewed its first-quarter numbers, admissions fell. This caused a 16% plunge in HMA and sparked a hospital sector sell-off. In this video, Fool health-care analyst David Williamson discusses what this means for investors heading into earnings season.