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Several approaches to the formation of three-dimensional (3D) fibrous scaffolds using different electrospinning process: (a) liquid-collecting electrospinning [62]; (b) gas foaming [63]; (c) self-assembly [64]; and (d) fibrous yarn scaffolds [65]; (e) schematic illustration of a hydrogel-integrated fibrous scaffold [66]; (f) a hybrid system using 3D printing and electrospinning [67].
