| http://www.w3.org/ns/prov#value | - According to one aspect of the current invention, calibration is periodically checked at any suitable time or location, such as during visits to the physician's office by having the patient perform Valsalva maneuvers by exhaling into a pre-calibrated apparatus 23 containing a second transducer similar to that shown in FIG. 2, such that airway pressure exceeds 40 mm Hg for at least 8 seconds.
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