7Kawashima K, Motohashi Y, Fujishima I. Prevalence of dyspha- gia among community-dwelling elderly individuals as estimat- ed using a questionnaire for dysphagia sereening [J]. Dyspha- gia, 2004, 19(4): 266-271.
8Achem SR, Devault KR. Dysphagia in aging [J]. J Clin Gastro- enterol, 2005, 39(5): 357-371.
9Jantsch E. The evolutionary vision: Toward a unifying para- digm of physical, biological, and sociocultural evolution [R]. Boulder, Colorado: Westview Press, 1981 : 83-116.
10Low J, Reed A. Electrotherapy Explained, Principles and Prac- tice [M]. 3rd ed. Oxford: Butterworth-Heinemann, 2000: 121-122.