Letter to the editor regarding "Methotrexate treatment in hand osteoarthritis refractory to usual treatments: A randomised, double-blind, placebo-controlled trial"
1 The Second Hospital of Lanzhou University, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, No.82 Cuiyingmen, Chengguan District, Lanzhou City 730030, Gansu, China.
2 The Second Hospital of Lanzhou University, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, No.82 Cuiyingmen, Chengguan District, Lanzhou City 730030, Gansu, China. Electronic address: xyylzu@126.com.