title: Answer to the Letter to the Editor concerning "Is the 4 mm height of the vertebral artery groove really a limitation of C1 pedicle screw insertion" by Da-Geng Huang, et al. Eur Spine J (2014) 23(5):1109-1114.
authors.affiliation: Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University College of Medicine, No. 76 Nanguo Road, Xi'an, 710054, Shaanxi, People's Republic of China, hdgrichard@sina.com.
authors.forename: Da-Geng
authors.initials: DG
authors.lastname: Huang
authors.forename: Ding-Jun
authors.initials: DJ
authors.lastname: Hao
mesh_terms: D001270:Cervical Atlas / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D065289:Pedicle Screws