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The terms of arrangement have been reviewed and approved by Georgia Tech in accordance with its conflict of interest policies. O.T.I. is a scientific advisor for Physiowave Inc., a manufacturer of ballistocardiogram sensing hardware. M.J.M. and D.G. declare that there are no competing interests.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"19"}}