[vtkusers] How to get patient's information using vtkMedicalImageReader2 ?

[iono sphere]

vtkMedicalImageReader2* medimg = vtkMedicalImageReader2::New();
medimg->SetFileName(argv[1]);
medimg->Update();
printf("Patient gender:
%s\n",medimg->GetMedicalImageProperties()->GetPatientSex());
printf("Age %s\n",medimg->GetMedicalImageProperties()->GetPatientAge());
printf("Modality %s\n",medimg->GetMedicalImageProperties()->GetModality());

I'm 100% sure that the file is already in the right place, but all these
methods return null. Am I missing something here?

Thank you in advance,
Iono
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