Sites of PBMT-sMF irradiation. The neck and shoulder region were separated in three zones for the irradiation of PBMT-sMF. The SE25 plus LS50 emitters were positioned over the first target area: spinous processes of C3, left elevator scapulae, left trapezius (1). The SE25 plus LS50 emitters were then positioned over the second target area: spinous processes of C7, right elevator scapulae, right trapezius (2). The SE25 plus LS50 emitters were then positioned over the third and final target area: spinous process of T4, left rhomboid major, and right rhomboid major (3). Circles represent the LS50 emitter and squares represent the SE25 emitters.