1. Liver Cirrhosis Study Group, Department of Gastroenterology, General Hospital of Northern Theater Command (Formerly General Hospital of Shenyang Military Area), Shenyang, Liaoning Province, China
2. Postgraduate College, Jinzhou Medical University, Jinzhou, Liaoning Province, China
3. Postgraduate College, Dalian Medical University, Dalian, Liaoning Province, China
4. Medicina Interna 1, Azienda di Rilievo Nazionale ad Alta Specializzazione Civico-Di Cristina-Benfratelli, Piazzale Leotta 4, 90100 Palermo, Italy