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Schematic representation of the dorsal grid for pressure pain threshold (PPT) assessments. The PPTs were measured over 6 points located on the trapezius muscle (P1-P2), infraspinatus (P3), posterior deltoid (P4), latissimus dorsi (P5) and lateral deltoid (P6). d = distance between the seventh cervical vertebra (C7) and acromion (ACR) on the x-axis.
