2Lois VC, Elizabeth CS. Scientific inquiry:cancer pain in children :the selection of a model to guide research. Yournal for Specialists in Pediatrie[J]. Nursing philadelphia, 2002,8 ( 12 ) : 10.
3Clccland CS,Gonin R,Halficld AK,et al. Pain and its treatment in outpatients with metastatic cancer[J]. N Engl Med, 1994,15 ( 3 ) : 330-592.