Erratum: Incorrect values for intractable and cluster headaches at enrollment shown in figure 1 and incorrect prevalence of headache at ten years in text of the article by hanly et al (Arthritis and Rheumatology (2013))

1. Hanly, J.G.
2. Urowitz, M.B.
3. O'Keeffe, A.G.
4. Gordon, C.
5. Bae, S.-C.
6. Sanchez-Guerrero, J.
7. Romero-Diaz, J.
8. Clarke, A.E.
9. Bernatsky, S.
10. Wallace, D.J.
11. Ginzler, E.M.
12. Isenberg, D.A.
13. Rahman, A.
14. Merrill, J.T.
15. Petri, M.
16. Fortin, P.R.
17. Gladman, D.D.
18. Fessler, B.J.
19. Alarcõn, G.S.
20. Bruce, I.N.
21. Dooley, M.A.
22. Steinsson, K.
23. Khamashta, M.A.
24. Ramsey-Goldman, R.
25. Manzi, S.
26. Sturfelt, G.K.
27. Nived, O.
28. Zoma, A.A.
29. Van Vollenhoven, R.F.
30. Ramos-Casals, M.
31. Aranow, C.
32. Mackay, M.
33. Ruiz-Irastorza, G.
34. Kalunian, K.C.
35. Lim, S.S.
36. Inanc, M.
37. Kamen, D.L.
38. Peschken, C.A.
39. Jacobsen, S.
40. Theriault, C.
41. Thompson, K.
42. Farewell, V.
43. Mostrar todos los/as autores/as +