1 Spine and Spinal Cord Surgery Unit, Department of Neurological Sciences, Presidio Ospedaliero Santa Maria della Misericordia, Udine, Italy - rossella.rispoli@asufc.sanita.fvg.it.
2 Spine and Spinal Cord Surgery Unit, Department of Neurological Sciences, Presidio Ospedaliero Santa Maria della Misericordia, Udine, Italy.