J Korean Neurosurg Soc. 2018;61(2):186-193.   Published online February 28, 2018
DOI: https://doi.org/10.3340/jkns.2017.0404.019

J Korean Neurosurg Soc. 2011;50(2):109-113.
DOI: https://doi.org/10.3340/jkns.2011.50.2.109

J Korean Neurosurg Soc. 2008;43(2):85-89.
DOI: https://doi.org/10.3340/jkns.2008.43.2.85

J Korean Neurosurg Soc. 2006;39(1):52-57.