The primary objective is to determine if patent foramen ovale (PFO) closure with the GORE® HELEX® Septal Occluder / GORE® CARDIOFORM Septal Occluder plus antiplatelet medical management is safe and effective and reduces the risk of recurrent stroke or imaging-confirmed transient ischemic attack (TIA) when compared to antiplatelet medical management alone in patients with a PFO and history of cryptogenic stroke or imaging-confirmed TIA.