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(This is all speculation as I've never done this before.  There are probably people in the forum that have) Be aware you're switching from a ccTLD to a gTLD.  Is the clinic primarily for Canadian residents?  In the simplest terms, switching from a .ca to a .clinic may hurt your Canadian rankings, and help your rankings everywhere else.  If you want your site to continue targeting Canadians specifically, you can set that in your Google Webmaster Tools, although I think having the .ca domain itself is a stronger indicator to Google that your site is geared towards Canadians.