Authors’ contributions
RECRUITMENT
Jie gao was responsible for the recruitment, randomization and tracheal tube anesthetic. Hailiang Zhang, Ying li, Lei Zhang, Taiyang Li and Min Wang performed anesthesia management and data collection. Erfei zhang, Xiaoying Zhao and Ting Li analyzed data and wrote manuscript. Erfei zhang reviewed/edited manuscript. The author(s) read and approved the final manuscript.