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            studied. The cell accumulation time by SSAW using the   6.    Zhuang P, Sun A X, An J, et al., 2018, 3D neural tissue
            high-frequency (23.8 MHz) excitation could be reduced
            by ~2.5 fold compared to that using the low-frequency   models: From spheroids to bioprinting. Biomaterials, 154:
            (10.4 MHz) frequency excitation in the simulation. Size   113–133. http: //dx. doi. org/ 10.1016/j.biomaterials.2017.
            of cell spheroids formed by the high-frequency excitation is   10.002
            smaller  than  that  by  the  low-frequency  excitation  by   7.    Lee J M, Sing S L, Tan E Y S, et al., 2016, Bioprinting in
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            illustrates no influence of acoustic manipulation and suggests   8.    Kolesky D B, Truby R L, Gladman A, et al., 2014, 3D
            the acoustically prepared cell spheroids as good candidate   bioprinting  of  vascularized,  heterogeneous  cell-laden
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            Conflict of Interest                                   and organs. Nat Biotechnology, 32(8): 773–785. http://dx.
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            Fund (AcRF) Tier 1 (RG171/15), Ministry of Education,   11.   Ji  S,  Guvendiren  M,  2017,  Recent  advances  in  bioink
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