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Barbara Sylvester, BSN, RN Staff Nurse II, Global Medical Services Image Print Profile Request an Appointment Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Phone: 617-355-6000 Listen Barbara Sylvester, BSN, RN Staff Nurse II, Global Medical Services Medical Services Programs & Services General Pediatrics Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Phone: 617-355-6000