title: Letter to the Editor concerning "ALIF and total disc replacement versus 2-level circumferential fusion with TLIF: a prospective, randomized, clinical and radiological trial" by Hoff EK, Strube P, Pumberger M et al. (2015). Eur Spine J. Mar 7. [Epub ahead of print].
authors.affiliation: Department of Orthopedics, Yuhungding Hospital, Qingdao University, Shandong, China. njqspine@163.com.|Department of Orthopedics, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA. njqspine@163.com.
authors.forename: Jianqiang
authors.initials: J
authors.lastname: Ni
authors.affiliation: Department of Orthopedics, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA.
authors.forename: Kirkham B
authors.initials: KB
authors.lastname: Wood
authors.affiliation: Department of Orthopedics, Yuhungding Hospital, Qingdao University, Shandong, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, GRJ 1215, Boston, MA, 02114, USA.
authors.forename: Guoan
authors.initials: G
authors.lastname: Li