Such anecdotes add to the body of evidence that the medical literature continues to be systematically
http://plosmedicine.org/article/info:doi/10.1371/journal.pmed.1001084#article1.body1.sec1.p7

Can anecdotes ever provide evidence that something happens systematically? Don't you need data for that? The problem with anecdotes is that you have no information on how representative they are, and anecdotes of bad behaviour often come to light precisely because they describe unusually egregious breaches of normal standards of behaviour.