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Liu Y, Springer IN, Zimmermann CE, Açil Y, Scholz-Arens K, Wiltfang J, Terheyden H.Liu Y, et al. Among authors: terheyden h.Clin Oral Implants Res. 2008 May;19(5):497-504. doi: 10.1111/j.1600-0501.2007.01504.x. Epub 2008 Mar 26.Clin Oral Implants Res. 2008.PMID: 18371097