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At Oceana Gastroenterology Associates, Dr. M. Mazen Jamal provides diagnosis and treatment for a wide range of gastrointestinal issues for patients in Corona, Riverside, and Inland Empire areas of California. Some of our procedures include Endoscopic Ultrasonography, Therapeutic ERCP, Colonoscopy, Upper Endoscopy, Bravo pH Testing, and Capsule Endoscopy.