Comparison of methods for calculating glomerular filtration rate: technetium-99m-DTPA scintigraphic analysis, protein-free and whole-plasma clearance of technetium-99m-DTPA and iodine-125-iothalamate clearance. - Goates JJ; Morton KA; Whooten WW; Greenberg HE; Datz FL; Handy JE; Scuderi AJ; Haakenstad AO; Lynch RE (Journal of nuclear medicine : official publication, Society of Nuclear Medicine, 1990)