remove bspline fitting from fieldmap estimation
remove bspline fitting from fieldmap estimation

poldracklab/preprocessing-workflow,poldracklab/fmriprep,oesteban/preprocessing-workflow,poldracklab/fmriprep,oesteban/fmriprep,oesteban/fmriprep,oesteban/fmriprep,poldracklab/fmriprep,poldracklab/preprocessing-workflow,oesteban/preprocessing-workflow