title: The sixth Italian Supplement.
authors.affiliation: IRCCS Istituto Ortopedico Galeazzi, Via Riccardo Galeazzi, 4, 20161, Milan, Italy. c.lamartina@chirurgiavertebrale.net.
authors.forename: Claudio
authors.initials: C
authors.lastname: Lamartina
authors.affiliation: Istituto Ortopedico Rizzoli, University of Bologna, Via Pupilli 1, 40136, Bologna, Italy.
authors.forename: Cesare
authors.initials: C
authors.lastname: Faldini
authors.affiliation: Policlinico Universitario Campus Bio-Medico, Clinica Ortopedia e Traumatologia, Via Alvaro del Portillo, 200, 00128, Rome, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Denaro