Observer bias in drug trial.
D000639:Amitriptyline / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D003863:Depression / Q000188:drug therapy*; D006801:Humans; D007099:Imipramine / Q000627:therapeutic use*; D012106:Research
D000639:Amitriptyline; D007099:Imipramine