Graft-implanted, enzyme responsive, tacrolimus-eluting hydrogel enables long-term survival of orthotopic porcine limb vascularized composite allografts: A proof of concept study. - Fries CA; Lawson SD; Wang LC; Slaughter KV; Vemula PK; Dhayani A; Joshi N; Karp JM; Rickard RF; Gorantla VS; Davis MR (PloS one, 2019)