In my humble opinion, there are many things which happen that are not widely reported. So we have to search for info and it's a lot of work to educate oneself. There were 4 reference links in Dr. Mercola's article. You put one of them into your post 3 times.
I've presented the article above for people to read. These are the references given by Dr. Mercola. I read through some of them. People will need to read them and draw their own conclusions, if interested in doing so.