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Karen Costas, MPH, RD, LDN Clinical Nutrition Specialist (Per Diem), Division of Gastroenterology, Hepatology and Nutrition Image Phone 617-355-6058 Fax 617-730-0495 Print Profile Request an Appointment Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Phone: 617-355-6000 Listen Karen Costas, MPH, RD, LDN Clinical Nutrition Specialist (Per Diem), Division of Gastroenterology, Hepatology and Nutrition Medical Services Programs & Services Epilepsy Center Metabolism Program Nutrition Center Gastroenterology, Hepatology and Nutrition Languages English Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Phone: 617-355-6000