5Wagner EH, Laeroix AZ, Grothdua L, et al. Preventing disability and falls in older adults population based randomized trial[J].Am J Public Health,1994,84:1800.
6WongM,Edelstein J,Wollman J,BondMG.Ultrasonic-pathological comparison of the human arterial wall.Verification of intima-media thickness J.Arteroscler Thromb,1993,13(4):482