[1] Dalian Med Univ, Affiliated Hosp 1, Coll Integrat Med, Dept Gastroenterol 2,Neurogastroenterol and Motil, 222 Zhongshan Rd, Dalian 116011, Liaoning, Peoples R China
[2] Dalian Med Univ, Affiliated Hosp 1, Clin Lab, 222 Zhongshan Rd, Dalian 116011, Liaoning, Peoples R China
[3] Dalian Univ, Affiliated Zhongshan Hosp, Dept Neurosurg 2, 6 Jiefang St, Dalian 116001, Liaoning, Peoples R China
[4] Nanjing Drum Tower Hosp, Dept Gastroenterol, 321 Zhongshan Rd, Nanjing 210008, Jiangsu, Peoples R China
[5] Queen Mary Univ London, Sch Engn & Mat Sci, London E1 4NS, England
[6] Johns Hopkins Ctr Neurogastroenterol, Div Gastroenterol & Hepatol, Baltimore, MD 21224 USA