English: clinical trial where either the patient/subject getting treatment does not know which treatment they are getting but the researcher does or the patient knows but the researcher/assessor has been blinded
Japanese: 盲検化した臨床試験。研究者や評価者と治療を受ける患者または被験者を対立項として、どちらか一方にどの治療法を採用したか教えない方法 。