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Mao, et al.
           supply. Finally, GFP-HUVECs  and  H9C2  cells  were      https://doi.org/10.1038/s41551-018-0224-z
           mixed  with  inner-layer  collagen  and  out-layer  alginate   5.   Miller JS, Stevens KR, Yang MT, et al., 2012, Rapid Casting
           solution, respectively, to fabricate  3D  pre-vascularized   of Patterned  Vascular Networks for Perfusable Engineered
           cardiac  constructs.  It  was noted  that  the  HUVECs   Three-dimensional Tissues. Nat Mater, 11:768.
           encapsulated in collagen gel were able to spread and align      https://doi.org/10.1038/NMAT3357
           along the filaments surrounded by the H9C2 cells in the
           3D constructs. These results demonstrate that this coaxial   6.   Mao M, Bei HP, Lam CH, et al., 2020, Human-on-Leaf-Chip:
           EHD bioprinting method has great potential to fabricate   A  Biomimetic  Vascular System Integrated  with Chamber-
           complex 3D tissues or organs with vascular network.     Specific Organs. Small, 16:2000546.

           Acknowledgments                                         https://doi.org/10.1002/smll.202000546
                                                               7.   He J, Mao M, Liu Y, et  al., 2013, Fabrication  of Nature-
           This  work  was  financially  supported  by  the  National   Inspired  Microfluidic  Network  for  Perfusable  Tissue
           Key  Research  and  Development  Program  of  China     Constructs. Adv Healthc Mater, 2:1108–13.
           (2018YFA0703000), the Key Research Project of Shaanxi      https://doi.org/10.1002/adhm.201200404
           Province  (2020GXLH-Y-021), Guangdong Basic  and
           Applied Basic Research Foundation (2020B1515130002),   8.   Lenoir L, Segonds F, Nguyen KA, et al., 2019, A Methodology
           The  Youth  Innovation  Team  of Shaanxi  Universities,   to  Develop a Vascular  Geometry  for  In Vitro Cell  Culture
           and the Fundamental  Research  Funds for the Central    Using Additive Manufacturing. Int J Bioprint, 5:238.
           Universities.                                           https://doi.org/10.18063/ijb.v5i2.238

           Conflict of interest                                9.   Mirabella  T, MacArthur JW, Cheng D, et al., 3D-printed
                                                                   Vascular  Networks Direct  Therapeutic  Angiogenesis  in
           No conflict of interest were reported by the authors.   Ischaemia. Nat Biomed Eng, 1:0083.

           Author contributions                                    https://doi.org/10.1038/s41551-017-0083
                                                               10.  Yao R,  Alkhawtani  AY, Chen R, et al., 2019, Rapid and
           M.M. and H.L. designed the overall experimental plan    Efficient In Vivo Angiogenesis Directed by Electro-assisted
           and performed experiments. M.M. wrote the manuscript
           with support from H.L. and J.H., and co-authors A.K.,   Bioprinting of Alginate/Collagen Microspheres with Human
           Y.Z., L.W., and X.L. involved in the investigation  and   Umbilical Vein Endothelial Cell Coating Layer. Int J Bioprint,
           analysis of results. J.H. and D.L. supervised the project   5:194.
           and conceived the original idea.                        https://doi.org/10.18063/ijb.v5i2.1.194
                                                               11.  Hasan A,  Paul A,  Vrana  NE, et al.,  2014,  Microfluidic
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