Many resources can be found at AHRQ’s Patient Safety Network website. In the redesigned site, you may have to dig to find what you’re looking for, but it is worth the effort to try. One of our favorite pages is the All Topics page for adverse events and other safety problems, linked here. There are a number of case studies and many journal articles. Includes studies and reports from the National Health Service of the United Kingdom. The Agency for Healthcare Research and Quality is a federal agency.