Does the treatment ladder for systemic therapy in moderate to severe psoriasis only go up? The percentage of patients with severe psoriasis on biologics increases over time

1. Carrascosa, J.M.
2. Rivera, N.
3. Garcia-Doval, I.
4. Carretero, G.
5. Vanaclocha, F.
6. Daudén, E.
7. Gómez-García, F.J.
8. De-la-Cueva-Dobao, P.
9. Herrera-Ceballos, E.
10. Belinchón, I.
11. Alsina, M.
12. Sánchez-Carazo, J.L.
13. Ferrán, M.
14. Lopez-Estebaranz, J.L.
15. Pérez-Zafrilla, B.
16. Llamas, M.
17. Rivera, R.
18. Ferrándiz, C.