title: Answer to the Letter to the Editor of Guoping Liao et al. concerning "Comparison of unilateral versus bilateral pedicle screw fixation in lumbar interbody fusion: a meta-analysis" by W. Ding et al. (2014) Eur Spine J 23(2):395-403.
authors.affiliation: Department of Orthopedics, Shenzhen Sixth People's Hospital, No. 89 Taoyuan Road, Shenzhen, 518052, China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Ding
authors.affiliation: Department of Spine Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58 Zhongshan Er Road, Guangzhou, 510080, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Spine Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58 Zhongshan Er Road, Guangzhou, 510080, China. zhengzml@163.com.
authors.forename: Zhaomin
authors.initials: Z
authors.lastname: Zheng