Patients 47.5 years of age were more likely to have one drug exposure (P = 0.004; OR 15.4; 95% CI 1.8, 135), whereas those >7.5 years of age were more likely to have two drug exposures (P = 0.008; OR 18.9; 95% CI 1.0, 358) in the 6 months before illness onset (Table 4) . Of interest, >25% of the medication usage documented included drugs that were potentially photosensitizing or myopathic [26] [27] [28] [29] [30] [31] . There were no other differences noted in medication usage between clinical or autoantibody phenotypes, nor were there any differences by gender, race, disease course or delay to diagnosis.