Oral administration of nutrients and water should be restricted as it may cause vomiting and irreversible cellular damage in gastrointestinal tract. (cat-health-guide.org)
I also work closely with a team of genetic counselors to evaluate and advise patients with a strong personal risk of gastrointestinal tract cancers because of a family or personal history. (cinj.org)
An X-ray depicts the upper gastrointestinal tract of an obese patient six months after gastric bypass surgery. (discovermagazine.com)