Fig. 2
From: Recent advances in smart stimuli-responsive biomaterials for bone therapeutics and regeneration

Timeline of some representative studies of the application of smart stimuli-responsive biomaterials in the past half-decade. Figures for years 2016–2020: Image for 2016: reproduced with permission.115 Copyright 2016, Royal Society of Chemistry; Image for 2017: reproduced with permission.104 Copyright 2017, Elsevier; Image for 2018: reproduced with permission.19 Copyright 2018, Elsevier; reproduced with permission.155 Copyright 2018, American Chemical Society; Image for 2019: reproduced with permission.54 Copyright 2019, Elsevier; reproduced with permission.61 Copyright 2019, American Chemical Society; reproduced with permission.77 Copyright 2019, Wiley-VCH; Image for 2020: reproduced with permission.31 Copyright 2020, American Chemical Society; reproduced with permission.126 Copyright 2020, Royal Society of Chemistry