N12 HEALTH: Undergoing an advanced endoscopy can be essential for diagnosing and treating complex gastrointestinal issues. Dr. Vivek Kesar from stonybrookmedicine shared some lifesaving information. (Sponsored by: stonybrookmedicine) Watch News 12 and tune into our stories for more. . . . #News12LI #LI #LongIsland #Health #HealthNews