Measurement of biochemical markers
After 15 minutes of semi-supine rest, blood samples were obtained from an antecubital vein into tubes containing ethylenediaminetetraacetic acid (EDTA) to prevent coagulation. Troponin I concentrations were measured by chemiluminescent immunoassay using an Immulite 2500 (Siemens Medical Solutions, Erlangen, Germany). KİM-1 and suPAR were measured by enzyme-linked immunosorbent assay (Elabscience human ELISA kit, UK).