GSTM1 and transient ischemic attack: Hb: hemoglobin; TLC: total leukocyte count; DM: diabetes mellitus; HTN: hypertension; CKD: chronic kidney disease; ARDS: acute respiratory distress syndrome; MHD: maintenance hemodialysis; NIV: non-invasive ventilation; TIA: transient ischemic attack; IHD: ischemic heart disease; STEMI: ST-elevated myocardial infarction; NA: not available; ND: not done