[1] UNSW, Fac Med, St Vincents Clin Sch, Sydney, NSW, Australia
[2] St Vincents Hosp, Dept Gastroenterol, Sydney, NSW, Australia
[3] UNSW, Fac Med, South Western Sydney Clin Sch, Sydney, NSW, Australia
[4] St Vincents Hosp, Dept Med Imaging, Sydney, NSW, Australia
[5] Univ Padua, Dept Med, Padua, Italy
[6] St Vincents Hosp, Dept Neurol & Immunol, Sydney, NSW, Australia