PRTN3 and chronic purulent otitis media: RBS: random blood sugar; HIV: human immunodeficiency virus; WBC: white blood cells; RBC: red blood cells; RFT: renal function test; LFT: liver function test; CT: computed tomography; c-ANCA: cytoplasmic antineutrophil cytoplasmic antibody; ASOM: acute suppurative otitis media; CSOM: chronic suppurative otitis media; CoNS: coagulase-negative staphylococci; GPA: granulomatosis with polyangiitis