[Orgmode] Load macros from other files?

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Is there a way to load macros from another file?

The "include" command doesn't seeem to work. For example, the following does 
*not* work.

macro.org:
#+MACRO: hello Hello world

and include.org:
#+INCLUDE: "./macro.org"
{{{hello}}}

I'm using org-mode 7.01g.


--Thanks!

Uriel Avalos