Association Between Menopausal Factors and the Risk of Seronegative and Seropositive Rheumatoid Arthritis: Results From the Nurses' Health Studies
Bengtsson C, Malspeis S, Orellana C, Sparks Ja, Costenbader Kh, Karlson Ew
Arthritis care & research 2017;69(11):1676-1684

Oral contraceptives, breastfeeding and the risk of developing rheumatoid arthritis: results from the Swedish EIRA study
Orellana C, Saevarsdottir S, Klareskog L, Karlson Ew, Alfredsson L, Bengtsson C
Annals of the rheumatic diseases 2017;76(11):1845-1852

Parity influences the severity of ACPA-negative early rheumatoid arthritis: a cohort study based on the Swedish EIRA material
Pikwer M, Orellana C, Källberg H, Pikwer A, Turesson C, Klareskog L, et al
Arthritis research & therapy 2015;17():358-

Postmenopausal hormone therapy and the risk of rheumatoid arthritis: results from the Swedish EIRA population-based case-control study
Orellana C, Saevarsdottir S, Klareskog L, Karlson Ew, Alfredsson L, Bengtsson C
European journal of epidemiology 2015;30(5):449-57

Parity and the risk of developing rheumatoid arthritis: results from the Swedish Epidemiological Investigation of Rheumatoid Arthritis study
Eira Study Group, Orellana C, Wedrén S, Källberg H, Holmqvist M, Karlson Ew, et al
Annals of the rheumatic diseases 2014;73(4):752-5