Transthoracic cardiac ultrasonic stimulation induces a negative chronotropic effect. - Buiochi, Elaine Belassiano; Miller, Rita J; Hartman, Emily; Buiochi, Flávio; Bassani, Rosana Almada; Costa, Eduardo T; O' Brien Jr, Willian D (IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2012)