Update README.md

README.md

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 Publicly available datasets, including T1w brain data from Calgary-Campinas Public Brain MR Database<sup>1</sup>, T2w brain data from fastMRI database<sup>2</sup> , and SWI data from OpenNeuro database<sup>3</sup>, were used for training and evaluating our proposed approach.
 
 
-1 <https://sites.google.com/view/calgary-campinas-dataset/download?authuser=0>
-2 <https://fastmri.med.nyu.edu/> 
-3 <https://openneuro.org/datasets/ds000221/versions/1.0.0> 
+[1] <https://sites.google.com/view/calgary-campinas-dataset/download?authuser=0>  
+[2] <https://fastmri.med.nyu.edu/>   
+[3] <https://openneuro.org/datasets/ds000221/versions/1.0.0>