1. Spilker B, Molinek F, Jhnston K, Simpson RL, Tilson HH. Quality of life bibliography and indexes. Med Care 1990; 28 (suppl.): D51–77.
2. Wilkin D, Hallam L, Doggett M. Measure of Need and Outcome for Primary Care. Oxford: Oxford University Press, 1992.
3. Gokal R. Quality of life in patients undergoing renal replacement therapy. Kidney Int 1993; 43 (suppl. 40): S23–7.
4. Editorial. Quality of life and clinical trials. Lancet 1995; 346 (8966): 1–2
5. Medical Research Council. Advice to applicants of clinical trial proposal, July 1993.