Effect of esketamine on postoperative depressive symptoms in patients undergoing thoracoscopic lung cancer surgery: A randomized controlled trial oleh Shu-lin Gan, Shu-lin Gan, Yu-qin Long, Yu-qin Long, Qin-yun Wang, Qin-yun Wang, Chang-dong Feng, Chang-dong Feng, Chen-xu Lai, Chen-xu Lai, Chun-tong Liu, Chun-tong Liu, Yun-ying Ding, Yun-ying Ding, Hong Liu, Ke Peng, Ke Peng, Fu-hai Ji, Fu-hai Ji