1 Department of Gastroenterology, Dalian Municipal Central Hospital, No. 826, Southwest Road, Hekou District, Dalian City, 116023, Liaoning Province, China.
2 The Third Department of Cadres, 967 Hospital of the Joint Logistics Support Force of the Chinese People's Liberation Army, No. 80 Shengli Road, Xigang District, Dalian, 116000, Liaoning Province, China.