CD40LG and dermatomyositis: The median time from DM symptom onset to the blood sample assayed for anti‐ACE2 IgM was 1.3 years for the anti‐ACE2‐IgM‐negative group compared with 0.7 years in the anti‐ACE2‐IgM‐positive group (Wilcoxon rank sum test P = 0.41).