Correlations between cerebrospinal fluid homovanillic acid and dopamine transporter SPECT in degenerative parkinsonian syndromes.

"Declarations Conflict of interestThe authors have no competing interests to declare. Ethical approvalThis study was approved by the Institutional Review Board of the Tokyo Metropolitan Institute of Gerontology and was performed in accordance with the ethical standards of the 1964 Declaration of Helsinki and its later amendments. Consent to participateWritten informed consent was obtained from all participants or their caregivers. Consent for publicationAll images are entirely unidentifiable and there are no details on the individuals reported. Conflict of interest The authors have no competing interests to declare."

"Funding This study was supported by Intramural Research Grants from Tokyo Metropolitan Geriatric Hospital (M. Kurihara, K.Kanemaru), Research Grant from Integrated Research Initiative for Living Well with Dementia (M. Kameyama), JSPS KAKENHI Grant Numbers JP22H04923 (CoBiA) (Y.Saito, S.Murayama) and JP22K15740 (T.Matsubara), Grants-in Aid from the Research Committee of CNS Degenerative Diseases, Research on Policy Planning and Evaluation for Rare and Intractable Diseases, Health, Labour and Welfare Sciences Research Grants, the Ministry of Health, Labour and Welfare, Japan, Grant No. 20FC1049 (Y.Saito, S.Murayama), and AMED under Grant No. JP22wm0425019 (Y.Saito, S.Murayama) and JP22dk0207057h0001 (A. Iwata)."