A ventricular septal defect (VSD) is a hole in the septum, which is the wall separating the two lower chambers of the heart. In many cases, the hole closes on its own. A ventricular septal defect is a ...
Frank DeStefano, MD, MPH, was there in the early days of the CDC's Vaccine Safety Datalink (VSD), which first came online in 1990, when the agency convinced four health maintenance organizations (HMOs ...
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