1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
2. Fundamental Industry Training Center, Tsinghua University, Beijing 100084, People’s Republic of China
3. Department of Mathematical Science, Tsinghua University, Beijing 100084, People’s Republic of China
4. Department of Gastroenterology, Beijing Tsinghua Changgung Hospital, Beijing 102218, People’s Republic of China