Perinatal characteristics, early life infections and later risk of rheumatoid arthritis and juvenile idiopathic arthritis
Objectives: To investigate the importance of birth characteristics and early life infections on the risk of later rheumatoid arthritis (RA) and juvenile idiopathic arthritis (JIA). Methods: A nationwide register-based case-control study was performed based on prospectively recorded data on individuals born in 1973 or later. Using the Swedish inpatient register and the early arthritis register, cas