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APA Citation
Gustavsen, M., Celius, E., Winsvold, B., Moen, S., Nygaard, G., Berg-Hansen, P., Lie, B., Zwart, J., & Harbo, H. (2016). migraine and frequent tension-type headache are not associated with multiple sclerosis in a Norwegian case-control study. Multiple sclerosis journal, experimental, translational and clinical, 2, . http://access.bl.uk/ark:/81055/vdc_100167100912.0x000072