作者单位:NIA, Unit Clin & Translat Neurosci, Lab Behav Neurosci, IRP,Biomed Res Ctr, Baltimore, MD 21224 USA[1]Univ New South Wales, Bioanalyt Mass Spectrometry Facil, Sydney, NSW, Australia[2]Univ New South Wales, Sch Psychiat, Ctr Hlth Brain Ageing, Fac Med, Sydney, NSW, Australia[3]