1Bums N, Grove SK. The practice of nursing research[ M]. 3rd ed. Philadelphia : W. B. Saunders Company, 1998:542-547.
2Ferrand E, Bachoud-Levi AC, Rodrigues M, et al. Decision- making capacity and surrogate designation, in French ICU patients [ J ]. Intensive Care Med, 2001,27 ( 8 ) : 1360-1364. DOI : 10. 1007/s001340100982.
3Super DE. Career choice and development. A life-span,life-space approach to career development [ M ]. San Fan Francisco : Jossey- Bass, 1990 : 197-261.