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- [3] Retraction Note to: Investigation of the structural properties and bioactivity of P2O5–CaO–Na2O–TiO2 glass and glass-ceramics synthesized via a novel sol–gel method by acetone and DMF solvents(Journal of Sol-Gel Science and Technology, 10.1007/s10971-020-05401-0) Journal of Sol-Gel Science and Technology, 2022, 103 (02):