The UT electrode was placed at 50% on the line from the
acromion to the spine on vertebra C7; the MT electrode was
placed at 50% between the medial border of the scapula and the
spine at the level of T3; the LT electrode was placed at 2/3 on the
line from the trigonum spinae to the eighth thoracic vertebra; and
the SA electrode was placed over the seventh rib on the anterior
axillary line.