The severity of preoperative anemia escalates risk of poor short-term outcomes after lumbar spine fusion. - Issa TZ; Lee Y; Heard JC; Lambrechts MJ; Giakas A; Mazmudar AS; Vaccaro A Jr; Henry TW; Kalra A; Fras S; Canseco JA; Kaye ID; et al. (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, 2023)