title: An easy method to monitor the calibration of ultrasound instruments.
authors.forename: J P
authors.initials: JP
authors.lastname: Haugen
authors.forename: R L
authors.initials: RL
authors.lastname: Stamper
mesh_terms: D002138:Calibration; D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*; D014463:Ultrasonography / Q000295:instrumentation*