The measurement of pain: a new approach to an old problem.
D000700:Analgesics; D018712:Analgesics, Non-Narcotic; D058633:Antipyretics; D003061:Codeine; D006801:Humans; D010146:Pain
D000700:Analgesics; D018712:Analgesics, Non-Narcotic; D058633:Antipyretics; D003061:Codeine
ANALGESICS AND ANTIPYRETICS; CODEINE; PAIN