Placebo. Hands holding two identical capsules,one of which is medically inactive (a placebo) while the other is a drug or medicine. In clincal drug trials a placebo is used as a control. 'Double-blind' trials require that neither the patient nor the experimenter knows which is the control and which is the drug,in order to reduce bias | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Molloy, Cordelia |
Taille de l’image : | 3404 px × 2241 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |