Bishton, M., Crooks, C., Liu, H., Ban, L., Bythell, M., Card, T., Lanyon, P., Nanduri, V., Rankin, J., Stilwell, P., & West, J. Haemphagocytic Lymphohistiocytosis in an English Nationwide Cohort Confirms Increasing Incidence and Variation in Trigger Factors