From 3 to 8 clusters: a machine learning-based classification of operated adult spinal deformity patients. - Roscop C; Bourghli A; Baroncini A; Alanay A; Pellise F; Kleinstueck F; Pizones J; Charles YP; Larrieu D; Boissière L; Obeid I (The spine journal : official journal of the North American Spine Society, 2026)