Medical specialization dates back at least to the time of Galen. For most of medicine’s history, however, the boundaries of medical fields have been based on factors such as patient age (pediatrics and geriatrics), anatomical and physiological systems (ophthalmology and gastroenterology), and the physician’s toolset (radiology and. University Of Sydney Australia Macquarie University is a place of pioneering minds, breaking free of conventions. Discover our story as one of the…