what are the names of different types of doctors?
['Allergists. An allergist or immunologist focuses on preventing and treating allergic diseases and conditions. ... ', 'Dermatologists. ... ', 'Infectious disease doctors. ... ', 'Ophthalmologists. ... ', 'Obstetrician/gynecologists. ... ', 'Cardiologists. ... ', 'Endocrinologists. ... ', 'Gastroenterologists.']