1. Gould TH, Crosby DL, Harmer M et al (1992) Policy for controlling pain after surgery: effect of sequential changes in management. Br Med J: 305: 1165–1166
2. Oates JDL, Snowden SL, Jayson DWH (1994) Failure of pain relief after surgery. Attitudes of ward staff and patients to postoperative analgesia. Anaesthesia: 49: 755–758
3. Warfield CA, Kahn CH (1995) Acute pain management. Programs in US hospitals and experiences and attitudes among US adults. Anesthesiology:83: 1090–1094
4. Tittle M, McMillan SC (1994) Pain and pain-related side effects in an ICU and on a surgical unit: nurses’ management. Am J Crit Care: 3: 25–30
5. Wulf H, Neugebauer E, Maier C (1997) Die Behandling akuter perioperativer und posttraumatischer Schmerzen. Empfuhlungen einer interdiszplinaeren Expertenkommission. G. Thieme, Stuttgart, New York.