Diurnal variations in salivary protein carbonyl levels in normal and cognitively impaired human subjects
Haixiang Su, Mervyn Gornitsky, Guoyan Geng, Ana M. Velly, Howard Chertkow, and Hyman M. Schipper
Age (Dordr). 2008 March; 30(1): 1–9. Published online 2008 January 4. doi: 10.1007/s11357-007-9042-z.PMCID: PMC2276593