How the EpiPen drug price story went viral - and what may be next

What's the recipe for a drug pricing controversy? The biopharmaceutical industry is under attack for its bafflingly complex pricing, and the target du jour is Mylan: The public and politicians are seething over the fact that the drug maker's epinephrine injector, the EpiPen, has more than quintupled in cost since 2007. It now retails for more…