which one is correct, or more commonly used?

`病院に行きます` or `病院へ行きます`??

when should I use `へ` instead of `に`? Thanks!
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2014-06-10T23:33:31.280
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2014-06-10T23:33:31.280
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question
usage
病院に行きます　or 病院へ行きます?