Balair J., Louis M., Lavon P., Polansky M.Studies without internal controls. N Engl J Med1984; 311: 156-163.
4.
Hill ABMedical ethics and controlled trials. Br Med J1963; i: 1043-49.
5.
Faithfull S.How many subjects are needed in a research sample in palliative care?Palliat Med1996; 10: 259-61.
6.
McQuay H., Carroll D., Moore A.Variation in the placebo effect in randomised controlled trials of analgesics: all is as blind as it seems. Pain1996; 64: 331-35.
7.
Belison H., Friedman R.Harnessing the power of the placebo effect and renaming it 'remembered wellness '. Ann Rev Med1996; 47: 193-99.
8.
Thalidomide: 20 years on [Editorial]. Lancet1981; 2: 510.
9.
Baines M., Kirkham SRCancer pain. In: Wall PD, Melzack R eds. Textbook of pain, 2nd edition. London: Churchill Livingstone, 1989: 590-97.
10.
Thompson JW, Regnard C.Pain. In: Regnard C, Hockley JM eds. Flow diagrams in advanced cancer and other diseases. London: Edward Arnold, 1995: 5-10.
11.
Isbister WH , Elder P., Symons L.Non-operative management of malignant intestinal obstruction. J R Coll Surg Edin1990; 35: 369-72.
12.
Baines M., Sykes N.Gastrointestinal symptoms. In: SaundersC, Sykes N. The management of terminal malignant disease, 3rd edition. London: Edward Arnold, 1993: 63-75.
13.
Schwartz D., Flamant R., Lellouch J., translated Healy MJR. Clinical trials. London: Academic Press, 1980.
14.
Dunlop GMA study of the relative frequency and importance of gastrointestinal symptoms and weakness in patients with far-advanced cancer: student paper. Palliat Med1990; 4: 37-43.
15.
Turner JA, Deyo RA, Laeser JD et al. The importance of placebo effects in pain treatment and research . JAm Med Assoc1994; 271: 1609-14.