The Location Radius feature is meant to narrow a search to the closest range one is willing to travel in order to access the study site. For example, if the ball is placed at a 10-mile radius location, one is able to travel from 0 to 10 miles of their location to participate in a clinical trial.

Study start date: The actual date on which the first participant was enrolled in a clinical study. The 'estimated' study start date is the date that the researchers think will be the study start date. Primary completion date: The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The 'estimated' primary completion date is the date that the researchers think will be the primary completion date for the study. First posted date: The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date. Results first posted date: The date on which summary results information was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay between the date the study sponsor or investigator first submits summary results information (the results first submitted date) and the results first posted date. Some results information may be available at an earlier date if results first posted with QC comments. Last update posted date: The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.