sentence1: unlike the previous years , the brats 2017 training dataset , which consists of 210 hgg and 75 lgg cases , was annotated manually by one to four raters and all segmentations were approved by expert raters .
sentence2: the brats 2018 training dataset , which consists of 210 hgg and 75 lgg cases , was annotated manually by one to four raters and all segmentations were approved by expert raters .