Additional file 1: of Prognostic effect of factors involved in revised Tokuhashi score system for patients with spinal metastases: a systematic review and Meta-analysis YangXiong-gang LunDeng-xing HuYong-cheng LiuYong-heng WangFeng FengJiang-tao HuaKun-chi YangLi ZhangHao XuMing-you ZhangHao-ran 2018 Appendix 1. Searching strategies used for the literature retrieving. (DOCX 13 kb)