Takahashi, M.; Takahashi, S.; Mori, A.; Hatachi, S.; Saito, T.; Shinohara, M.; Kumagai, S. Early Erythrocyte Methotrexate Polyglutamate-4 Predicts Treatment Response and Is Influenced by GGH 401C>T Genotype in Patients With Rheumatoid Arthritis. Archives of Rheumatology 2026, 41, 125-133.