\begin{figure}[htbp]
\centering
  \subfigure[][]{\label{subfig:a}
    \includegraphics[width=0.17\linewidth]{./images/ROI_slice_nr_17_gray.pdf}}
  \subfigure[][]{\label{subfig:b}
  \includegraphics[width=0.17\linewidth]{./images/ROI_slice_nr_25_gray.pdf}}
  \subfigure[][]{\label{subfig:c} \includegraphics[width=0.17\linewidth]{./images/ROI_slice_nr_39_gray.pdf}}
  
  \caption{Examples of three axial slices with regions of interest (ROI) defined by the expert physician. \protect\subfigref{subfig:a} Red - Inferior  frontal  gyrus/Orbitofrontal; Dark and light blue - Lateral temporal; Light green and orange - Mesial temporal; \protect\subfigref{subfig:b} Dark and light blue - Lateral temporal; Red - Inferior and superiro anterior cingulate ; \protect\subfigref{subfig:c} Light red - Inferior and superior anterior cingulate ; Yellow and orange - Dorsolateral parietal; Dark red - Posterior cingulate and precuneus. Some slices do not contain any anatomical ROI.}
  \label{fig: ROI}
\end{figure}