1. Morphine metabolism: Does the renal hypothesis hold water?;Hanks;Lancet,1985
2. Clinical measurement of pain;Houde,1965
3. The measurement of pain: Prototype for the quantitative study of subjective responses;Beecher;Pharmacol Rev,1957
4. Letter to the editor
5. The effectiveness of oral analgesics (morphine, codeine, acetylsalicylic acid) and the problem of placebo "reactors" and "non-reactors";Beecher;J Pharmacol Exp Ther,1953