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Different types of 3D bioprinters. (a) Inkjet- and (b) extrusion-based bioprinters were reproduced with permission from [17]; Copyright 2013 John Wiley and Sons. (c) laser-assisted bioprinter was reproduced from [18]; (d) stereolithography-based bioprinter was reproduced from [19]; (e) acoustic and (f) microvalve bioprinters were reproduced permission from [20]. Copyright 2016 Elsevier; (g) scaffold-free bioprinter was reproduced from [21].
