title: Are intra-articular injections of hylan more effective than injections of hyaluronic acid for knee osteoarthritis?
authors.affiliation: Guy's and St Thomas' NHS Foundation Trust, London, UK. frances.m.williams@kcl.ac.uk
authors.forename: Frances M K
authors.initials: FM
authors.lastname: Williams
authors.forename: Tim D
authors.initials: TD
authors.lastname: Spector