The present invention relates to methods of treating cancers, e. Remaining amounts of memory capacity which can be used to store video andor audio data can be displayed as respective numbers of standard document pages and telephone calls, the latter representing standard-duration recording intervals. At least a portion of the second screen is oriented at an angle to the first screen, and apertures extend through a perforated region of the second screen. Barrier ribs are mounted between the first substrate and the second substrate, the barrier ribs defining a plurality of discharge cells and a plurality of non-discharge regions.