An excellent article is : Treating non-motor symptoms. of Parkinson’s Disease With Transplantation of Stem Cells by Paolina Pantcheba et al. This article is excellent for physicians and medical personnel and supports your work. Today I am sure I am getting improvement in non-motor symptoms of PD and it has been less than a month since I was at your office. Tomorrow I will decrease some of my medication. I will remain eternally grateful to you. Whitney Neuhaus