World Health Organization. Cancer pain relief. Geneva: WHO, 1986.
2.
Stjernsward J, Colleau SM, Ventafridda V. The World Health Organization Cancer Pain and Palliative Care Program. Past, present, and future. J Pain Symptom Manage1996; 12: 65–72.
3.
World Health Organization. Cancer Pain Relief. 2nd ed.Geneva: WHO, 1996.
4.
Jadad AR, Browman GP. The WHO analgesic ladder for cancer pain management. Stepping up the quality of its evaluation. JAMA1995; 274: 1870–1873.
5.
Twycross R, Lickiss N. Pain control and the World Health Organization Analgesic Ladder. JAMA1996; 275: 835-835.
6.
Ventafridda V, Stjernsward J. Pain control and the World Health Organization Analgesic Ladder. JAMA1996; 275: 835–836.
7.
Ahmedzai SH. Window of opportunity for pain control in the terminally ill. Lancet2001; 357: 1304–1305.
