Epidemiology of medical error | BMJ: "The Harvard and Australian studies into medical error remain the only studies that provide population level data on the rates of injuries to patients in hospitals and they identified a substantial amount of medical error
In the United States medical error results in 44 000–98 000 unnecessary deaths each year and 1 000 000 excess injuries"
http://www.bmj.com/content/320/7237/774
