1. Department of Cardiology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250033, P.R. China
2. Department of Gastroenterology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250033, P.R. China
3. Department of Hematology, The Qilu Children's Hospital of Shandong University, Jinan, Shandong 250033, P.R. China