s2334

Based on this [link](https://nipype.readthedocs.io/en/0.11.0/users/joinnode_and_itersource.html#itersource) I also tried: ``` infosource.iterables = [("subject_id", ["01","02"]), ("session", {"01":["s1","s2"],"02":["s1","s2","s3"]})] OSError: No files were found matching anat template: /sub-01/01/sub-01_01_T1w.nii.gz ``` And also ``` infosource1 = Node(IdentityInterface(fields=["subject_id"]),...