IHF may appear attractive for investors looking to tap into the health care sector, but caution is warranted here. The fund's two largest holdings: UnitedHealth Group ( UNH) and Express Scripts ( ESRX), together account for more than a quarter of its total portfolio. Market Vectors Solar Energy ETF (KWT) -0.6% While major stock market averages managed to find some footing this week, it has been stop and go for the solar sector. With global turmoil still weighing heavily, funds like KWT and are struggling to stage a bounce off all-time lows. In the week ahead, industry giant, First Solar ( FSLR) is slated to step up to the earnings plate. While a strong showing may help to reinvigorate this corner of the alternative energy industry, I advise investors to stick to the sidelines.