Update of the position paper of the Spanish Society of Rheumatology on biosimilar drugs Miguel Ángel Abad Hernández; José Luis Andreu; Alejandro Balsa Criado; Federico Díaz-González; José Vicente Moreno Muelas; Rubén Queiro Silva; Juan J. Gómez-Reino;

Effectiveness, safety and economic analysis of Benepali in clinical practice Marta Rojas-Giménez; Natalia Mena-Vázquez; Carmen María Romero-Barco; Sara Manrique-Arija; Inmaculada Ureña-Garnica; Gisela Diaz-Cordovés; Francisco Gabriel Jiménez-Núñez; Antonio Fernández-Nebro;

Practical aspects of biological throught levels and antidrug antibodies in rheumatoid arthritis and spondyloarthritis José Rosas; María Martín-López; Teresa Otón; Alejandro Balsa; Jaime Calvo-Alén; Raimon Sanmartí; Jesús Tornero; Loreto Carmona;