The therapeutic experiment:  observations on the meaning of controls and on biologic variation resulting from the treatment situation.
D001688:Biological Products; D003033:Coal Tar; D004912:Erythrocytes / Q000378:metabolism*; D006801:Humans; D010600:Pharmacology; D010919:Placebos; D013812:Therapeutics
D001688:Biological Products; D010919:Placebos; D003033:Coal Tar
DRUGS/effects; ERYTHROCYTES/metabolism; PLACEBOS; THERAPEUTICS