Global Smart Hearing Aid Market By Type (Behind-the-ear (BTE) Hearing Aids, In-the-ear (ITE) Hearing Aids, In-The-Canal (ITC) Hearing Aids, and Others), By Application (Congenital Hearing Loss, Age-Related Hearing Loss, Acquired Trauma Hearing Loss), By Region and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028