3Madden C. Undergraduate nursing students'acquisition and retention of CPR knowledge and skills [ J ]. Nurse Education Today, 2006, 26 (3) : 218 -227.
4Spooner BB, Fallaha JF, Koeierz L, et al. An evaluation of objective feedback in basic life support ( BLS ) training [ J ]. Resuscitation, 2007, 73 (3): 417-424.