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Vaso‐occlusion crisis (VOC) risk stratification. Hazard ratio (HR) and HR range for patient groups stratified as high (score = 2), medium (score =1) and low (score = 0) risk of VOC events. Stratification was based on the cut‐off values described above (408 cells/mm2 for FA‐WB‐VCAM and 46 cells/mm2 for FA‐WB‐Psel).
