CHI3L1 and Behcet disease: To study associations with markers of immune activation in BD, we also measured serum levels of high‐sensitive C‐reactive protein (hsCRP) (Fernandes et al., 2016), monocyte chemoattractant protein‐1 (MCP‐1) (Misiak et al., 2020), chitinase 3‐like protein 1 (YKL‐40) (Jakobsson et al., 2015), and the soluble cluster of differentiation 14 (sCD14) (Jakobsson et al., 2015).