GSTM1 and Miyoshi myopathy: At the time of MM diagnosis, the mean Hb level was 8.31 (1.2) g/dL, the median serum β2-microglobulin level was 6.5 (IQR 5.7) mg/L, and the median serum calcium and albumin were 3.30 (IQR 0.6) mmol/L and 29.0 (IQR 3.0) g/L, respectively.