Effectiveness and safety of intra-articular hyaluronic acid SEMICAL GEL-B CROSS therapy in knee osteoarthritis (SEM-ART1): Study protocol for a randomized, placebo controlled, double-blind, cross-over clinical trial. - Filiz, Meral Bilgilisoy; Hekim, Hanife Hale; Bal, Ahmet; Kara, Aslıhan (PLoS ONE, 2026)