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. 2022 Oct 19;15(10):1282. doi: 10.3390/ph15101282

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

An overview of stimuli-responsive hydrogels and their applications for 4D printed drug delivery systems. Created with BioRender.com. Adapted with permission from [2]. Copyright © 2019 Springer Nature.