Magnet-tipped tubes for studies of the stomach and duodenum.
D004386:Duodenum; D005750:Gastric Juice / Q000032:analysis; D006801:Humans; D007419:Intestinal Secretions / Q000032:analysis; D007441:Intubation, Gastrointestinal / Q000295:instrumentation*; D008280:Magnetics; D008297:Male; D008722:Methods; D012867:Skin; D013270:Stomach