Authors: Marinus de Kleuver; Stephen J Lewis; Niccole M Germscheid; Steven J Kamper; Ahmet Alanay; Sigurd H Berven; Kenneth M Cheung; Manabu Ito; Lawrence G Lenke; David W Polly; Yong Qiu; Maurits van Tulder; Christopher Shaffrey Journal: Eur Spine J Date: 2014-06-24 Impact factor: 3.134