Welcome back to Squawk on the Street. Healthc care you might know the worst performing sector of the year so far. Just one of just three still in the red since January after we got weakness in one part of the market.The health insurers names like Centine, UNH, Molina, Eleance all have had bad news last couple of weeks. Down double digits on the year and more than cut in half off of their 52- week highs. It's been a non-stop stream of bad news from almost all of those names.Yeah, brutal. Also pharma as well. ...