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Thickness of the sternocleidomastoid muscle (mm) 12.0 (8.7–18.0) 5.3 (4.6–6.9) 0.001* 12.1 (8.5–17.4) 5.2 (4.8–6.9) 0.001* Difference from thickness of contralateral sternocleidomastoid muscle (mm) 5.3 (3.5–13.3) 0.0 (0.0–0.1) <0.001* 5.1 (3.5–13.0) 0.0 (0.0–0.4) <0.001* Ratio (thickness of sternocleidomastoid muscle/thickness of contralateral sternocleidomastoid muscle) 2.8 (1.7–3.8) 1.0 (1.0–1.0) <0.001* 2.6 (1.7–3.9) 1.0 (1.0–1.1) 0.001* Elastography score 3.0 (2.5–3.0) 2.0 (1.0–2.0) 0.001* 3.0 (2.5–3.0) 2.0 (1.0–2.0) 0.001*

Erratum to: Value of adding sonoelastography to conventional ultrasound in patients with congenital muscular torticollis