Number of positive staining in mononuclear cell/macrophages counted in 3 fields under x400 magnifications (light microscope, field number 18); 0: no positive cells; +: 1-10 positive cells; ++: 11-20 positive cells; +++: 21-30 positive cells; ++++: 31-40 positive cells; +++++: >41 positive cells; hepatocytes and spindle-shaped cells with positive staining were not counted; nd: not done; pos: intracytoplasmic granular staining in the renal tubular epithelium; neg: no staining in the renal tubular epithelium.