Challenges in optimising patient participation in research: do patients participating in meetings represent the actual patient population with Behçet’s syndrome? - Taflan, Sıtkı Safa; Esatoglu, Sinem Nihal; Ozguler, Yesim; Yurttas, Berna; Melikoglu, Melike; Hatemi, Gulen (Annals of the rheumatic diseases, 2022)