Every good thing must come to an end -- and, eventually, the bull market we're experiencing will, too. Long-term investors must prepare for that to happen at some point.

One of the best ways to do so is to buy stocks that can perform well through bull runs but can also hold down the fort when things aren't going so well. That's what it takes to deliver market-beating returns over long periods -- corporations that crumble under the pressure of bear markets aren't worth holding onto for the long haul.

Below, I'll discuss two stocks in the healthcare field that investors can confidently buy and hold for a long time: Intuitive Surgical (NASDAQ: ISRG) and DexCom (NASDAQ: DXCM).

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Source Fool.com