Stand-alone anchored cage versus cage with plating for single-level anterior cervical discectomy and fusion: a prospective, randomized, controlled study with a 2-year follow-up - Nemoto, O; Kitada, A; Naitou, S; Tachibana, A; Ito, Y; Fujikawa, A (Eur J Orthop Surg Traumatol, 2015)