All I know is that I never had visited an online health forum in my entire life until my health fell apart while I had the Mirena in. I am slowly getting better now that the Mirena is out. My Dr. also said the Mirena couldn't do this. Just about every one on this forum had a Dr. who said the Mirena could not to do this. But they are obviously wrong (the Drs.). Just keep reading, and you will start to see the truth.
Good luck in your research! Keep posting :)