1 Clinical and histological comparative outcomes after injections of poly-L-lactic acid and calcium hydroxyapatite in arms: A split side study. Mazzuco R, Evangelista C, Gobbato DO, de Almeida LM. J Cosmet Dermatol. 2022 Dec;21(12):6727-6733. doi: 10.1111/jocd.15356. Epub 2022 Sep 20. PMID: 36098704 2 Letter to the Editor: Post hoc analysis of "Clinical and histological comparative outcomes after injections of poly-L-lactic acid and calcium hydroxyapatite in arms: A split side study". McCarthy AD, Soares DJ. J Cosmet Dermatol. 2023 Oct;22(10):2871-2873. doi: 10.1111/jocd.15819. Epub 2023 May 17. PMID: 37194938 No abstract available. 3 Answer to the letter Post hoc analysis of "clinical and histological comparative outcomes after injections of poly-l-lactic acid and calcium hydroxyapatite in arms: A split side study". Mazzuco R. J Cosmet Dermatol. 2024 Jan;23(1):360. doi: 10.1111/jocd.15931. Epub 2023 Aug 13. PMID: 37574791 No abstract available. 4. Role of botulinum toxin A in improving facial erythema and skin quality. Hanna E, Xing L, Taylor JH, Bertucci V. Arch Dermatol Res. 2022 Oct;314(8):729-738. doi: 10.1007/s00403-021-02277-0. Epub 2021 Sep 14. PMID: 34519860