MPO and Oral ulcer: Additionally, when MPO-ANCA (or P-ANCA) positivity was included, similarly, oral ulcers (OR 0.066 95% CI 0.005, 0.920) and MPO-ANCA (or P-ANCA) positivity (OR 328.921, 95% CI 66.231, 1633.498) were significantly associated with OS-LN-AAV as well (Table S1).