Global Electroencephalography Amplifiers Market By Type (8-channel Amplifiers , 16-channel Amplifiers , 32-channel Amplifiers , 64-channel Amplifiers , 128-channel Amplifiers , and 256-channel Amplifiers), By Application (Medical Use , and Research Use), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029