3Jeffrey J, Dumont RA, Kim GY, et al. Effects of international health electives on medical student learning and career choice: results of a systematic literature review [ J ]. Family Medicine, 2011,43(1) :21 -28.
4Koplan JP,Bond TC,Merson MH,et al. Towards a common defini- tion of global health[J]. Lancet,2009,373(9679) :1993 - 1995.
