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           by shear stress, which is induced by cell-cell and   Engineering  International  Scholarship  Program,
           cell-material  interactions  during the  printing   and  US National  Science  Foundation  Award
           process.                                            #1762202.
             Third, there is a difference between the scaffold
           CAD  model  and  SBE  3D  printed  scaffold  after   References
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                                                               9.   Gao, F., Xu Z, Liang Q, et al., 2018, Direct 3D Printing of
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           Acknowledgments                                         28(13):1706644. DOI: 10.1002/adfm.201706644.
                                                               10.  Trachtenberg JE, Placone JK, Smith BT, et al., 2017, Extrusion-
           This work was supported by a grant of the Ministry      based 3D  Printing  of  Poly  (Propylene Fumarate) Scaffolds
           of Research and Innovation, CNCS – UEFISCDI,            with Hydroxyapatite Gradients.  J  Biomater Sci Polym Ed,
           Project Number PNIII-P4-ID-PCE-2016-0884                28(6):532–54. DOI: 10.1080/09205063.2017.1286184.
           within PNCDI III, the Charles M. Vest National      11.  Hockaday L, Kang KH, Colangelo NW, et al., 2012, Rapid
           Academy  of  Engineering  Grand  Challenges  for        3D  Printing of  Anatomically  Accurate and Mechanically

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