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. 2020 Jun 12;13(4):363–368. doi: 10.1136/neurintsurg-2020-016151

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Population flow chart for two studies for safety and efficacy at 3 years. * This patient had no vascular follow-up imaging at 1 year, but had it at 3 years. "lost to follow-up" means that the centers were unable to contact the patients using different techniques (phone call, email, letter, etc) so the patient exited the study. "missed visits" means that the patient did not attend the 3-year follow-up, but attended a later visit.