| http://www.w3.org/ns/prov#value | - In an embodiment, system 500 may include one or more mechanical sensors (e.g., microphones, accelerometers, resonators, pressure sensors, heart wall motions sensors, or other mechanical sensors, not illustrated) that may be placed in one or more positions that are relatively insensitive to heart sounds, but that are likely to sense noise due to exterior mechanical interactions.
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