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Naqvi, T. Z., Rafie, R., & Daneshvar, S. (2010). ORIGINAL INVESTIGATIONS: Potential Faces of Patent Foramen Ovale (PFO PFO). Echocardiography, 27(8), 897–907. doi:10.1111/j.1540-8175.2010.01165.x 
10.1111/j.1540-8175.2010.01165.x