[Comfortable sitting postures].
D000293:Adolescent; D000328:Adult; D006801:Humans; D007403:Intervertebral Disc / Q000033:anatomy & histology; D008159:Lumbar Vertebrae / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008297:Male; D011187:Posture; D011859:Radiography