title: Answer to the Letter to the Editor of M. Tyrakowski et al. concerning "Does whole-spine lateral radiograph with clavicle positioning reflect the correct cervical sagittal alignment?" by Park SM et al. (Eur Spine J; 24(1):57-62).
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Chung-Ang University, 224-1, Heukseok-dong, Dongjak-ku, Seoul, 140-757, Republic of Korea. ksong70@cau.ac.kr.
authors.forename: Kwang-Sup
authors.initials: KS
authors.lastname: Song
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Chung-Ang University, 224-1, Heukseok-dong, Dongjak-ku, Seoul, 140-757, Republic of Korea.
authors.forename: Hyun
authors.initials: H
authors.lastname: Kang