De Sousa KC, Almufarrij I, Kruger M, Manchaiah V, et al. Effectiveness of Over-the-Counter Hearing Aids Versus Professionally Fitted Devices: A Systematic Review and Meta-analysis. Otolaryngol Head Neck Surg 2026 Jun 17. doi: 10.1002/ohn.70306.
PMID: 42307981