2Visser PJ, Verhey FRJ, Scheltens P, et al. Diagnostic accuracy of the pre-clinical AD scale(PAS) in cognitively mildly impaired subjects. J Neurol 2002; 249:312 -9
3Woo J, Ho SC, Lau S, et al. Prevalence of cognitive impairment and associated factors among elderly Hong Kong Chinese aged 70 years and over. Neuropidemiology 1994; 13:50 -58
4McEntee WJ, Crook TH. Age-associated memory impairment: A role for catecholamines. Neurology 1990: 3:526
