Development and Validation of a Prediction Model for Pain and Functional Outcomes After Lumbar Spine Surgery. - Khor S; Lavallee D; Cizik AM; Bellabarba C; Chapman JR; Howe CR; Lu D; Mohit AA; Oskouian RJ; Roh JR; Shonnard N; Dagal A; et al. (JAMA surgery, 2018)