GSTM1 and B-cell chronic lymphocytic leukemia: CLL, chronic lymphocytic lymphoma; pFF, fragility fracture present; nFF, fragility fractures absent; WBC, white blood cell; IQR, interquartile range; Hb, hemoglobin; ALC, absolute lymphocyte count; SD, standard deviation; Vit D, vitamin D; TSH, thyroid-stimulating hormone; intmed, intermediate; LDH, lactate dehydrogenase; FISH, fluorescence in situ hybridization; IGHV, immunoglobulin heavy-chain variable region gene