Author contributions
D.A. and A.F. conceived the study and designed the experiments; F.T. performed the experiments and collected the MR data; D.A. supervised data collection; D.A., F.T., and A.E.F. processed the MR data; D.A. and A.E.F. analyzed the data and prepared the figures; D.A. prepared the brain images. D.A. and U.G. performed statistical data analysis; D.A., M.M., and A.F. interpreted the results and wrote the paper; all authors reviewed the paper.