J Korean Neurosurg Soc. 2015;58(1):60-64.   Published online July 31, 2015
DOI: https://doi.org/10.3340/jkns.2015.58.1.60

J Korean Neurosurg Soc. 2012;52(1):62-66.   Published online July 31, 2012
DOI: https://doi.org/10.3340/jkns.2012.52.1.62

J Korean Neurosurg Soc. 2011;50(1):11-16.
DOI: https://doi.org/10.3340/jkns.2011.50.1.11

J Korean Neurosurg Soc. 2009;46(6):581-583.
DOI: https://doi.org/10.3340/jkns.2009.46.6.581

J Korean Neurosurg Soc. 2009;46(5):501-504.
DOI: https://doi.org/10.3340/jkns.2009.46.5.501