gastroenterology sleeping proctology among ancient greeks hippocrates attributed digestion concoction galen 's concept stomach four ''faculties'' widely accepted modernity seventeenth century eighteenth century italian lazzaro spallanzani among early physicians disregard galen 's theories gave experimental proof action gastric juice foodstuffs german johann von zimmermann wrote important work dysentery maximilian stoll vienna described cancer gallbladder nineteenth century philipp bozzini made first attempt observe inside living human body using tube
Applied science Medicine and health Internal medicine Gastroenterology