Apparatus is provided including an electrode device, adapted to be coupled
to a site of a subject; and a control unit, adapted to drive the
electrode device to apply a current to the site intermittently during
alternating "on" and "off"periods, each of the "on" periods having an
"on" duration equal to between 1 and 10 seconds, and each of the "off"
periods having an "off"duration equal to at least 50% of the "on"
duration. Other embodiments are also described.