Rutherford, M., Scott, J., Karabayas, M., Antonelou, M., Gopaluni, S., Gray, D., Barrett, J., Brix, S., Dhaun, N., McAdoo, S., Smith, R., Geddes, C., Jayne, D., Luqmani, R., Salama, A., Little, M. & Basu, N. 2021, 'Risk factors for severe outcomes in patients with systemic vasculitis & COVID-19: a bi-national registry-based cohort study', Arthritis & Rheumatology, 73(9), pp. 1713-1719, article no: 41728. https://doi.org/10.1002/art.41728