what are nurse practitioner specialties?
['Adult-Gerontology Acute Care Nurse Practitioner.', 'Adult-Gerontology Primary Care Nurse Practitioner.', 'Cardiac Nurse Practitioner.', 'Neonatal Nurse Practitioner.', 'Oncology Nurse Practitioner.', 'Orthopaedic Nurse Practitioner.', 'Pediatric Acute Care Nurse Practitioner.']