title: Spontaneous change in frequency of deep-vein thrombosis detected by ultrasound.
mesh_terms: D000367:Age Factors; D006801:Humans; D007457:Iodine Radioisotopes; D011655:Pulmonary Embolism / Q000175:diagnosis / Q000453:epidemiology; D011877:Radionuclide Imaging; D013924:Thrombophlebitis / Q000175:diagnosis* / Q000453:epidemiology; D014463:Ultrasonography
chemical_list: D007457:Iodine Radioisotopes