A team of researchers is testing the effectiveness of a new HPV vaccine They randomly divide the subjects into two groups Group 1 receives existing HPV vaccine and Group 2 receives new HPV vaccine The patients in the study do not know which group they are in Which is the treatment group Group 1 Group 2 Neither group Which is the control group if there is one Group 1 Group 2 No control group Is this study blind double blind or neither Blind Double blind Neither Which best describes this research Placebo Controlled Experiment Survey Controlled Experiment Clinical Study O CO