Letter to the Editor: cause-and-effect relationships in biology.
D004194:Disease; D005246:Feedback; D006073:Gout / Q000209:etiology; D006801:Humans; D007855:Lead Poisoning / Q000209:etiology; D008175:Lung Neoplasms / Q000209:etiology; D011051:Poliomyelitis / Q000209:etiology