title: Comment on Roessler et al.: Short-term follow up after implantation of a cell-free collagen type I matrix for the treatment of large cartilage defects of the knee.
authors.affiliation: HELIOS ENDO-Klinik Hamburg, Hamburg, Germany. carl.haasper@helios-kliniken.de.
authors.forename: Carl
authors.identifier: http://orcid.org/0000-0003-1209-4721
authors.initials: C
authors.lastname: Haasper
mesh_terms: D002356:Cartilage; D002357:Cartilage Diseases; D002358:Cartilage, Articular; D019902:Chondrocytes; D024042:Collagen Type I; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint; D014182:Transplantation, Autologous
chemical_list: D024042:Collagen Type I