Answer to the Letter to the Editor of Weiss HR et al. concerning "Head to pelvis alignment of adolescent idiopathic scoliosis patients both in and out of brace" by Vergari C, Courtois I, Ebermeyer E, Pietton R, Bouloussa H, Vialle R, Skalli W (Eur Spine J; 2019: https://doi.org/10.1007/s00586-019-05981-8)
1 LBM/Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, 151 Boulevard de l'Hôpital, 75013, Paris, France. claudio.vergari@ensam.eu.
2 LBM/Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, 151 Boulevard de l'Hôpital, 75013, Paris, France.