Here is their statement about including Off & On: "The blog is an addictive mix of posts that showcase the author’s artistic talents, cutting-edge wit, and easy-to-digest data on the science and medicine surrounding Parkinson’s Disease."
There was no entry submitted, the Web Site apparently searches for blogs and judges which ones best meet their standards. Then they drop you a note about being selected. It's a nice surprise, and an honor.
There is a list along with short descriptions of each of the 14 blogs named to the list here.