It's based on what the story is and what their findings are. If you haven't seen many people with Parkinson's, and if you haven't seen many people with essential tremor.... It's often not diagnosed correctly.
For a lot of the people who come to see me, when I will tell them, yes, I think they have Parkinson's, they will reply, “Well, okay, my dad had Parkinson's, and my mother has Parkinson's.” Then you start asking what their symptoms are. It becomes quite clear that they don't have Parkinson's. They actually have essential tremor. But the family's been walking around thinking that they--