Sokal score

Failed to parse (syntax error): {\displaystyle \text{Sokal Score} = exp \left( \left[ 0.0116 \times \left( \text{age in years} – 43.4 \right) \right] + \left[ 0.0345 \times \left( \text{spleen size in cm below costal margin} – 7.51 \right) \right] + \left[ 0.188 \times \left( \left( \frac{\text{platelets in 109/L}}{700} \right)^2 – 0.563 \right) \right] + \left[ 0.0887 \times \left( \text{blasts in %} – 2.10 \right) \right] \right) }