Funding for this research was provided by:
National Natural Science Foundation of China (81773501)
The charity project of the national ministry of health (201202014)
The national science foundation of China (30930102, 81473033)
The national key R&D program of China (2016YFC0901404)
The Digestive Medical Coordinated Development Center of Beijing Hospital Authority (XXZ0204)
The science foundation of Peking University Cancer Hospital (2017-4, 2017-26)
The open project founded by the Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education/Beijing (2017-10)
Received: 15 October 2019
Accepted: 4 June 2020
First Online: 12 June 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Peking University School of Oncology, China (No. 2011101110). Informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.