The trend toward monitors got moving when cardiologist George Klein, of the University of Western Ontario, first approached Medtronic in 1989 with the idea of a semipermanent implant to measure heart rhythms.

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Mr. Klein is a professor of economics at George Mason University.

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Among the 84 signatories were such notables as Naomi Klein, Barbara Ehrenreich, Jonathan Lethem, George Saunders, Zadie Smith and Sam Lipsyte.

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Asked about Klein's attorneys saying he wants a role in the children's lives, George declined comment.

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