Acknowledgements
BLIND
The authors sincerely thank the RO physician team at Peking Union Medical College Hospital for their insightful comments on study design. The authors also thank Dr. Guichao Li, Hongzhen Li, Jinluan Li, Gang Ren, Xianan Li, Hao Wang, Fengpeng Wu, Ying Xiong, Weiwei Xiao, Yongjing Yang for their contribution in the blind and randomized evaluation.