I have known this for about six months, but it's finally sinking in with some research that I have been doing. This is so disheartening to me, as I have been an avid exerciser for 16 years. I already have mild arthritis because of it and I am only 30 years old. While in college I would run 7 miles a day, not knowing that I was beating up my body. I am a statistic, only 4% of the population have this probelm. I will keep going until I can't. I'm mad about this and I have to talk about it. Thank you.