If you feel vibrations inside your body but have no tremors, does that mean it's neurological? - Quora
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On the Influence of Freight Trains on Humans: A Laboratory Investigation of the Impact of Nocturnal Low Frequency Vibration and Noise on Sleep and Heart Rate | PLOS ONE
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Should I be concerned with a gurgling or vibrating feeling near my heart or left side of my chest? - Quora
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