Xu L, Varkey M, Jorgensen A, Ju J, Jin Q, Park JH, Fu Y, Zhang G, Ke D, Zhao W, Hou R, Atala A. Bioprinting small diameter blood vessel constructs with an endothelial and smooth muscle cell bilayer in a single step. Biofabrication. 2020 07 29; 12(4):045012.