The GRADE Working Group . Grading quality of evidence and strength of recommendations . BMJ2004; 328: 1490–1494 .
2.
US Department of Health and Human Services, Agency or Health Care Policy and Research . Acute pain management: operative or medical procedures and trauma. Clinical Practice Guideline No. 1. AHCPR Publication no. 92-0023. Rockville, MD: The Agency , 1993.
3.
Harbour R , Miller J . A new system for grading recommendations in evidence based guidelines . BMJ2001; 323: 334–336 .
4.
Ripamonti C . Management of dyspnea in advanced cancer patients . Supportive Care in Cancer1999; 7: 233–243 .
5.
Eiser N , Denman WT , West C , Luce P . Oral diamorphine: lack of effect on dyspnoea and exercise tolerance in the “pink puffer” syndrome . Eur Respir J1991; 4: 926–931 .
6.
Higginson IJ . Evidence based palliative care. There is some evidence-and there needs to be more . BMJ1999; 319: 462–463 .
7.
McQuay H , Moore A . Need for rigorous assessment of palliative care . BMJ1994; 309: 1315–1316 .
8.
Keeley D . Rigorous assessment of palliative care revisited. Wisdom and compassion are needed when evidence is lacking . BMJ1999; 319: 1447–1448 .
9.
Skrabanek P , McCormick J . Follies and Fallacies in Medicine. Glasgow: Tarragon Press , 1989: 30–30.