<qa>  What is the name of the alternate dose of Sonazoid?Following at least a one week of washout, the upper outer quadrant of the right breast will be injected with the alternate dose of Sonazoid and lymphosonography will again be used to identify the number, location and course of the LCs and SLNs. Volunteers who received the low dose during their first visit will receive the high dose the next time around and vice versa in a 1:1 ratio. All procedures from the initial visit will be repeated see above, except that the left breast injected initially will be assessed sonographically for the presence of contrast-enhanced tissues injection site as well as lymphatic structures prior to contrast administration in the right breast. 