Every trial must be recorded in a publically accessible database before the study starts, or within 30 days from its start. Clinicaltrial.gov is the most common site. A registered user can submit the study on the database, following the instruction provided in the webpage. At the end of the process, the study will be assigned a unique code that can be used in all official documentation as a reference number for the study (when applicable). Any records must be kept up to date.
