As many FierceHealthcare readers know, Pennsylvania's two biggest Blue Cross plans--Independence Blue Cross of Philadelphia and Highmark Inc. of Pittsburgh-- have proposed to merge. Right now, the jury's still out as to whether they'll get regulatory approval to close the deal, which requires state permission. But should it go forward? In the opinion of Tom Knox, former CEO of UnitedHealthcare of Pennsylvania, the answer is no. In this column, he explains why. Article