3-dimensional printing of hydrogel-based nanocomposites: A comprehensive review on the technology description, properties, and applications by Eil Bakhtiari, Sanaz Soleymani, Bakhsheshi-Rad, Hamid Reza, Karbasi, Saeed, Mahmood Razzaghi, Mahmood Razzaghi, Tavakoli, Mohamadreza, Ismail, Ahmad Fauzi, Sharif, Safian, RamaKrishna, Seeram, Chen, Xiongbiao, Berto, Filippo