Decades: 310s BC 300s BC 290s BC 280s BC 270s BC - 260s BC - 250s BC 240s BC 230s BC 220s BC 210s BC
Years: 269 BC 268 BC 267 BC 266 BC 265 BC - 264 BC - 263 BC 262 BC 261 BC 260 BC 259 BC
... The test uses an ultrasound probe applied to the anterior chest wall (or swallowed by the patient as in the case of the "transesophageal electrocardiogram") and ultrasound ...
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