J Korean Neurosurg Soc. 2014;56(2):149-151.   Published online August 31, 2014
DOI: https://doi.org/10.3340/jkns.2014.56.2.149

J Korean Neurosurg Soc. 2011;49(5):284-286.
DOI: https://doi.org/10.3340/jkns.2011.49.5.284

J Korean Neurosurg Soc. 2003;33(4):399-401.

J Korean Neurosurg Soc. 1993;22(7):828-833.