OK - fair enough that the source needs to be quoted. Here's the best I can do, cause it's been a long time. When I was first married, my father - in - law (a Doctor) pointed me to a medical journal discussing the stat that 85 % of problems that a doctor treats are iatrogenic, meaning caused by doctors. Later, when my brother became an emergency room physician, I discussed the stat with him. It came as no surprise to him and he shrugged his shoulders and said, "Oh, yah." And later he and my father-in-law were telling me that this is discussed in med school.
Best I can do at the moment. Let me get back to you with some research.
Edit:
Try
http://www.iatrogenic.org for starters.