Cholangioscopy-guided steroid injection for refractory post liver transplant anastomotic strictures: a rescue case series oleh Tomazo Franzini, Vitor M.T. Sagae, Hugo G. Guedes, Paulo Sakai, Daniel R. Waisberg, Wellington Andraus, Luiz A.C. D’Albuquerque, Amrita Sethi, Eduardo G.H. de Moura