We examined the documents in the CAS Content Collection associated with the PD research from the viewpoint of their relation to the PD risk factors (Figure ), as well their relative growth in the last five years (2019-2023) (Figure ). Understandably, the largest portion of the PD-related documents are associated with aging as a risk factor. Relatively small number of documents are associated with the lifestyle as a risk factor, but it clearly attracts attention in the recent years and exhibits the fastest growth.