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 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