6Dornan T, Hadfield J, Brown M.How can medical students learn in aselfdirected way in the clinical environment? Design-based research[J].Med Educ,2005, 39:356-364.
7Rhee K. Self-directed learning: to be aware or not to be aware[J].oumal of Management Education,2003,27(5):568-589.
8Clive S. Giamoietro G, Jaber F, et al. Qualitative researchpractice[ M] . London:Thousand oaks,2004:349.
9Wojnar DM, Swansn KM. Phenomenology: an explora-tion[J]. J Holist Nurs,2007,25,(3) : 172 -180.
10Gottlieb BH, Bergen AE. Social support concepts and meas-ures [J]. J Psychosomat Res,2010,69(5) :511 -520.