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