Complications of degenerative lumbar spondylolisthesis and stenosis surgery in patients over 80 s: comparative study with over 60 s and 70 s. Experience with 678 cases. - Aimar, Enrico; Iess, Guglielmo; Mezza, Federica; Gaetani, Paolo; Messina, Alberto Luca; Todesca, Andrea; Tartara, Fulvio; Broggi, Giovanni (Acta Neurochirurgica, 2022)