These companies could innovate their way to success.Healthcare stocks as a group have not performed on par with broader equities this year. However, that doesn't mean investors should avoid the sector altogether. Many healthcare companies appear to be attractive bets for those willing to stay the course for the next five years (and even beyond that).Let's consider these excellent candidates: CRISPR Therapeutics (CRSP 1.24%) and Vertex Pharmaceuticals (VRTX +0.96%), two innovative drugmakers. Here's why they ...