| http://www.w3.org/ns/prov#value | - According to the instant embodiment, the patient's at-rest position/orientation is preferably detected via a sensor 100 or 200 which might be a conventional pressure sensitive mat, a sensor that provides at least an approximate ???X??? and ???Y??? location of the patient (which might include such devices as a video camera, a grid of pressure sensitive sensors, a grid of temperature sensitive senso
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