if (verbose) std::cout << "SortOnPosition" << std::endl;
// (will be IPPSorter, in GDCM2)
s->ImagePositionPatientOrdering((*i).second);
if (verbose) std::cout << "SortOnPosition" << std::endl;
// (will be IPPSorter, in GDCM2)
s->ImagePositionPatientOrdering((*i).second);