Mitsuhiro Akiyama, Toshihiko Hidaka, Motohide Kaneko, Satoshi Ito, Hiroaki Taguchi, Tomonori Ishii, Shuji Asai, Shintaro Hirata, Kei Ikeda, Katsuya Suzuki, Naoki Kato, Yuko Kaneko. "Protocol: Filgotinib in addition to methotrexate versus filgotinib monotherapy in patients with rheumatoid arthritis with an inadequate response to methotrexate: A multicenter, prospective, open-label, randomized controlled trial (FAITHFUL Study)." PLoS ONE, 2025. doi:10.1371/journal.pone.0322621