GSTM1 and chronic kidney disease: ABI, ankle-brachial index; ADPKD, autosomal dominant polycystic kidney disease; Alb, albumin; cCa, corrected calcium; CKD, chronic kidney disease; eGFR, estimated glomerular filtration rate; Hb, hemoglobin; iPTH, intact parathyroid hormone; K, potassium; P, phosphate; RAAS, renin angiotensin aldosterone system; UA, uric acid