On 2013 Oct 26, Lorene M Nelson commented:

This article provides an excellent summary of the state of knowledge regarding the role of pesticides in the etiology of Parkinson’s disease, and nicely highlights the challenges faced by environmental epidemiologists in identifying specific pesticide chemicals that are associated with PD. I agree with Dr. Kamel that it has been difficult to make substantial progress in identifying specific pesticide chemicals that increase PD risk except in unique circumstances, such as the two recent high-quality cohort studies that she cites. Another notable example is the retrospective (case-control) study conducted in central California by Dr. Ritz (UCLA investigator) whose group has produced findings implicating workplace and ambient pesticide exposure in PD [Wang A, 2011; also cited by Dr. Kamel], well-water consumption Gatto NM, 2009, specific pesticide combinations Costello S, 2009, and gene-pesticide exposure interactions Manthripragada AD, 2010.

On 2013 Oct 26, Lorene M Nelson commented:

This article provides an excellent summary of the state of knowledge regarding the role of pesticides in the etiology of Parkinson’s disease, and nicely highlights the challenges faced by environmental epidemiologists in identifying specific pesticide chemicals that are associated with PD. I agree with Dr. Kamel that it has been difficult to make substantial progress in identifying specific pesticide chemicals that increase PD risk except in unique circumstances, such as the two recent high-quality cohort studies that she cites. Another notable example is the retrospective (case-control) study conducted in central California by Dr. Ritz (UCLA investigator) whose group has produced findings implicating workplace and ambient pesticide exposure in PD [Wang A, 2011; also cited by Dr. Kamel], well-water consumption Gatto NM, 2009, specific pesticide combinations Costello S, 2009, and gene-pesticide exposure interactions Manthripragada AD, 2010.