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1. Does Patent Foramen Ovale Promote Cryptogenic Stroke and Migraine Headache? Jonathan M. Tobis, MD and Babak Azarbal, MD Tex Heart Inst J. 2005; 32(3): 362–365.

2. Shah R, Devlin T. Initial Experience With a Fully Autonomous Robotic Transcranial Doppler (rTCD) System for Patent Foramen Ovale (PFO) Detection in Embolic Stroke of Undetermined Source (ESUS). In: International Stroke Conference. Los Angeles, CA; 2020.

3. Mascia L, Del Sorbo L. Diagnosis and management of vasospasm. F1000 Med Rep. 2009;1. doi:10.3410/m1-33

4. American Academy of Neurology. Assessment of Transcranial Doppler Ultrasonography. AAN Guideline Summary for Clinicians Assessment.

5. Proposed Standardized Neurological Endpoints for Cardiovascular Clinical Trials. Alexandra J. Lansky, MD. Eur Heart J. 2018 May 14; 39(19): 1687–1697.

6. Practice Standards for Transcranial Doppler (TCD) Ultrasound. Part II. Clinical Indications and Expected Outcomes. Andrei V. Alexandrov MD. J Neuroimaging 2012;22:215‐224.