GPT and chronic kidney disease: ALT, alanine aminotransferase; BUN, blood urea nitrogen; CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; eGFR, estimated glomerular filtration rate; FT4, free thyroxine; GD, Graves’ disease; MCV, mean corpuscular volume; TRAb, thyroid receptor antibodies; TSH, thyroid-stimulating hormone