1. Shandong University Cancer Center, Jinan, China.
2. Department of Gastroenterology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.
3. Department of Oncology, Zaozhuang Municipal Hospital, Zaozhuang, China.
4. Department of Oncology, Zaozhuang Cancer Hospital, Zaozhuang, China.
5. Molecular Pathology Laboratory, Department of Molecular and Clinical Cancer Medicine, Liverpool University, Liverpool, United Kingdom.