Systemic psoriasis therapy shows high between-country variation: A sign of unwarranted variation? Cross-sectional analysis of baseline data from the PSONET registries

1. Garcia-Doval, I.
2. Rustenbach, S.J.
3. Stern, R.
4. Dam, T.N.
5. Cohen, A.D.
6. Baker, C.
7. Spuls, P.I.
8. Naldi, L.