Bone tissue engineering gelatin–hydroxyapatite/graphene oxide scaffolds with the ability to release vitamin D: Fabrication, characterization, and in vitro study R Mahdavi, G Belgheisi, M Haghbin-Nazarpak, M Omidi, A Khojasteh, ... Journal of Materials Science: Materials in Medicine 31 (11), 97, 2020 | 49 | 2020 |