It's quite hard to be really bad physician - because Pareto principle applies to medicine. As far as I remember, 5 autoimmune diseases (of >120 described; ~4%)

It's quite hard to be really bad physician - because Pareto principle applies to medicine. As far as I remember, 5 autoimmune diseases (of >120 described; ~4%) make up for 80% of total autoimmune diseases. My relative did research on kidney diseases and results were similar.