Exploring the influence of baseline rheumatoid factor levels on TNF inhibitor retention rate in patients with rheumatoid arthritis: a multicentre and retrospective study oleh Cesar Díaz-Torné, Virginia Ruiz-Esquide, Clementina López-Medina, Alejandro Balsa, Alejandro Escudero-Contreras, Rafaela Ortega-Castro, Sara Manrique-Arija, Chamaida Plasencia-Rodríguez, Natalia Mena-Vazquez, Ana Martínez-Feito, Jerusalem Calvo-Gutiérrez, M Carmen Ábalos-Aguilera, Francisco Cepas, Regina Faré-García, Antoni Juan-Mas, Luis Sainz, Francisco Javier Godoy-Navarrete, Isabel Añón-Oñate, Marina Soledad Moreno-García