We wish to thank Yiting Zhou, postgraduate student in the Department of Epidemiology, School of Public Health, Medical College of Soochow University, and Yueping Shen, professor and director of the Department of Epidemiology, School of Public Health, Medical College of Soochow University, for providing statistical support. We also wish to thank Hang Su, doctoral candidate in the Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, and Wentao Yang, deputy director of Department of Thoracic Surgery, the Second Affiliated Hospital of Soochow University, for providing administrative support.
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