Apple is more concentrated on sensors for the iWatch. The first one is the glucose sensor. They really do not have the type of team to intelligently understand what ENDV is doing.
GSK and Google have committed themselves to the "implantable pill" which is a dead end given that non-invasive is the future.
Look to Johnson and Johnson, Medtronic, Phillips, GE etc. which are targeting heart failure for a possible acquirer.
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