Change the following
-gltLabel 4 control-stenosis -gltCode 4 'Group : 1*control-1*stenosis' \
-gltLabel 5 control-occlusion -gltCode 5 'Group : 1*control-1*occlusion' \
-gltLabel 6 stenosis-occlusion -gltCode 6 'Group : 1*stenosis-1*occlusion' \
to
-gltLabel 4 control-stenosis -gltCode 4 'Group : 1*control -1*stenosis' \
-gltLabel 5 control-occlusion -gltCode 5 'Group : 1*control -1*occlusion' \
-gltLabel 6 stenosis-occlusion -gltCode 6 'Group : 1*stenosis -1*occlusion' \
(It needs a space before -1 on each line)
Gang