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- [41] RETRACTION: Seasonal and Secular Periodicities Identified in the Dynamics of US FDA Medical Devices (1976-2020): Portends Intrinsic Industrial Transformation and Independence of Certain Crises (Retraction of Vol 56, Pg 104, 2021) THERAPEUTIC INNOVATION & REGULATORY SCIENCE, 2022, 56 (05) : 867 - 867