Investigating the Efficacy of Subharmonic Aided Pressure Estimation for Portal Vein Pressures and Portal Hypertension Monitoring - Dave, Jaydev K.; Halldorsdottir, Valgerdur G.; Eisenbrey, John R.; Merton, Daniel A.; Liu, Ji-Bin; Zhou, Jian-Hua; Wang, Hsin-Kai; Park, Suhyun; Dianis, Scott; Chalek, Carl L.; Lin, Feng; Thomenius, Kai E.; et al. (Ultrasound in Medicine & Biology, 2012)