Evaluation of the quality of care of elderly patients with chronic and breakthrough pain treated with opioids: SAND study

1. Rodríguez, M.J.
2. de la Torre, R.
3. Ortega, J.L.
4. Trinidad, J.M.
5. Benítez, D.
6. Jiménez, A.J.
7. Sanz-Yagüe, A.
8. Soler, B.
9. Torres, L.M.