21.99 million yuan. According to the official information of Beijing Tiantan Hospital, in 222, the total amount of national scientific research fund for neurology department of this hospital was 21.99 million yuan. Beijing Tiantan Hospital, founded on August 23rd, 1956, is a three-level first-class general hospital with neurosurgery as the forerunner and neuroscience cluster as the integration of medicine, teaching, research and prevention. It is the clinical, scientific research and teaching base of neurosurgery in Asia.