The Core Outcome Measures Index (COMI) comes of age: 18 years of efficient and effective patient-reported outcome measurement in the field of spinal disorders. Part 1. Development of the COMI, interpretation of scores, and use in research. - Mannion AF; Haschtmann D; Puhakka J; Kleinstück FS; Porchet F; Loibl M; Reitmeir R; Jeszenszky D; Fekete TF (European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2025)