 Study population: Females aged 12 - 18 years with one of the autoimmune diseases Juvenile Idiopathic Arthritis JIA, Systemic Lupus Erythematosus SLE and Juvenile Dermatomyositis JDM are included. Included females are treated at the rheumatology unit from the University Medical Center Utrecht. A small control group of healthy girls aged 13 -17 years will also be included to compare the kinetics of HPV serology with healthy individuals. 