Acknowledgements
This study was supported by Jiangsu Hengrui Pharmaceuticals Co., Ltd., which provided camrelizumab free of charge. We thank all the patients, their families, and the medical staff who participated in this study. We also thank Zheng Pang, Yufen Xiang, Yuyu Du, and Jinyun Sun from Jiangsu Hengrui Pharmaceuticals Co., Ltd. for their medical writing assistance, and Yitao Wang from Jiangsu Hengrui Pharmaceuticals Co., Ltd. for his statistical support.