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Ratih Dyah Utami and Nyilo Purnami and Viskasari Pintoko Kalanjati (2020) Characteristics of Down Syndrome Children with Delayed Speech and Hearing Loss in Audiology Clinic, Dr. Soetomo Surabaya Hospital. Indian Journal of Public Health Research and Development, 11 (5). pp. 758-762. ISSN 0976-5506; 0976-0245