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Olms C, Hix N, Neumann H, Yahiaoui-Doktor M, Remmerbach TW.Olms C, et al.Head Face Med. 2018 May 29;14(1):9. doi: 10.1186/s13005-018-0166-4.Head Face Med. 2018.PMID: 29843756Free PMC article.Clinical Trial.