In vivo 3D tomography of the lumbar spine using a twin robotic X-ray system: quantitative and qualitative evaluation of the lumbar neural foramina in supine and upright position. - Falkowski, Anna L.; Kovacs, Balazs K.; Benz, Robyn M.; Tobler, Patrick; Schön, Stephan; Stieltjes, Bram; Hirschmann, Anna (European Radiology, 2021)