Department of Gastroenterology & Hepatology;
Royal Adelaide Hospital;
Adelaide 5000;
Australia;
Investigation and Procedures Unit;
Repatriation General Hospital;
Daw Park 5041;
Australia;
Department of Medicine;
Centre for Gastroen-terological Research;
K.U.Leuven;
Leuven 3000;
Belgium;
Bolus volume; Health; Impedance; Luminal flow; Small intestine;