González-Alujas, T., Evangelista, A., Santamarina, E., et al. (2011) Diag-nosis and Quantification of Patent Foramen Ovale. Which Is the Reference Technique? Simultaneous Study with Transcranial Doppler, Transthoracic and Transesophageal Echocardiography. Revista Española de Cardiología, 64, 133-139.