Bias in association studies of systemic lupus erythematosus susceptibility due to geographical variation in the frequency of a programmed cell death 1 polymorphism across Europe

1. Ferreiros-Vidal, I.
2. D'Alfonso, S.
3. Papasteriades, C.
4. Skopouli, F.N.
5. Marchini, M.
6. Scorza, R.
7. Migliaresi, S.
8. Sebastiani, G.D.
9. Endreffy, E.
10. Mavromati, M.
11. Kappou-Rigatou, I.
12. Ruzickova, S.
13. Dostal, C.
14. Schmidt, R.E.
15. Witte, T.
16. Gomez-Reino, J.J.
17. Gonzalez, A.