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  1. Patent foramen ovale - Symptoms & causes - Mayo Clinic

  2. Patent foramen ovale - Diagnosis & treatment - Mayo Clinic

  3. Patent Foramen Ovale: Symptoms, Diagnosis, and Treatments - Healthline

  4. Patent Foramen Ovale (PFO): Symptoms, Causes & Treatment - Cleveland Clinic

  5. Patent Foramen Ovale (PFO) | American Heart Association

  6. Patent Foramen Ovale | Johns Hopkins Medicine

  7. Foramen ovale (heart) - Wikipedia

  8. OVALE definition | Cambridge Dictionary

  9. Patent foramen ovale - UpToDate

  10. Anatomy, Thorax, Heart Foramen Ovale - StatPearls - NCBI Bookshelf