More than one research site is participating in the study.
Sites from countries outside of the US are also participating.
Neither the research site nor the participant know what treatment the patient is receiving (there are methods of "unblinding" if medically necessary).
The treatment group the patient is assigned to is done randomly, like tossing a coin.
One treatment group consists of placebo, an inactive substance.
Patients will be changed from one treatment to another during the study as part of the study design.
The company or agency of the US government (such as the National Institutes of Health (NIH)) that provides funding for the study.