4Petersen RC. Mild cognitive impairment: transition from aging to Alzheimer's disease. Neurologia, 2000, 15(3): 93-101.
5Higgins JPT, Green S. Cochrane Handbook for Systematic Reviews of Interventions Version 5.1.0 [updated March 2011). The Cochrane Collaboration, 2011. Available at: www.Cochrane-handbook.org.
6Shea SJ, Bouter LM, Peterson J, et al. External validation of a measurement tool to assess systematic reviews (AMSTAR). PLoSONE, 2007, 2(12): e1350.
7The GRADE Working Group, 2009. Available at: http://www.cc ims.net/gradepro.
8Lam LC, Chau RC, Wong BM, et al. Chan. Interim Follow-up of a Randomized Cont-rolled Trial Comparing Chinese Style Mind Body (Tai Chi) and Stretching Exercises on Cognitive Function in Subjects at Risk of Progressive Cognitive Decline. Int l Geriatr Psychiatry, 2011, 26(27): 733-740.
9Lam LC, Chau RC, Wong BM, et al. A 1-year randomized controlled trial comparing mind body exercise (Tai Chi) with stretching and toning exercise on cognitive functi-on in older Chinese adults at risk of cognitive decline. [Am MedDirAssoc, 2012, 13(6): 568.
10Kwok TC, Bai X, Kao HS et al. Cognitive effects of calligraphy therapy for older people: a randomized controlled trial in Hong Kong. Clin IntervAging, 2011, 6: 269-273.
