Ultrasonic tissue characterization of vulnerable carotid plaque: correlation between videodensitometric method and histological examination - Baroncini, Liz Andréa V.; Pazin Filho, Antonio; Murta Júnior, Luiz Otávio; Martins, Antonio Roberto; Ramos, Simone Gusmão; Cerri, Jesualdo; Piccinato, Carlos Eli (Cardiovascular Ultrasound, 2006)