Sci. rep. (Nat. Publ. Group) Sci. rep. (Nat. Publ. Group) Cryopreservation of Human Mesenchymal Stem Cells in an Allogeneic Bioscaffold based on Platelet Rich Plasma and Synovial Fluid Gurruchaga Haritz Saenz del Burgo Laura Garate Ane Delgado Diego Sanchez Pello Orive Gorka Ciriza Jesús Sanchez Mikel Pedraz Jose Luis 2017 research-article