TY  - JOUR 
AU  - López López, Rafael
PY  - 2012
SN  - 1178-7090
UR  - http://hdl.handle.net/20.500.11940/5263
LA  - eng
TI  - Breakthrough cancer pain - Still a challenge
DO  - http://dx.doi.org/10.2147/JPR.S36428
T2  - JOURNAL OF PAIN RESEARCH
M2  - 559
VL  - 5
ER  -