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Department of Gastroentology, the Second Hospital of Hebei Medical University, Shijiazhuang, China; Department of Haematology, the Second Hospital of Hebei Medical University, Shijiazhuang, China Contributions: (I) Conception and design: Y Wang; (II) Administrative support: Y Wang, J Song; (III) Provision of study materials or patients: Y Wang, X Zhang; (IV) Collection and assembly of data: Y Wang, J Song; (V) Data analysis and interpretation: Y Wang, S Wen; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors. Correspondence to: Xiaolan Zhang. Department of Gastroenterology, the Second Hospital of Hebei Medical University, Shijiazhuang 050035, China. Email: [email protected].