title: Acoustic shadowing from neuraxial bone.
authors.affiliation: San Francisco General Hospital University of California San Francisco, California USA Email: graya@anesthesia.ucsf.edu.
authors.forename: X
authors.initials: X
authors.lastname: Ma
authors.affiliation: San Francisco General Hospital University of California San Francisco, California USA Email: graya@anesthesia.ucsf.edu.
authors.forename: A T
authors.initials: AT
authors.lastname: Gray
mesh_terms: D000775:Anesthesia, Spinal / Q000379:methods*; D005260:Female; D006801:Humans; D017846:Longitudinal Ligaments / Q000000981:diagnostic imaging*; D008297:Male; D014463:Ultrasonography