Comma seperated list of sites in {siteId}?

Hi, the API documentation seems pretty clear, but I've wondered about for example this command:
GET /service/api/console/gsm/{gsmKey}/sites/{siteId}
The documentation says: 
siteIdThe identifier of the site to query information for.
string required
But I was wondering if you can use a Comma separated list of different sites?
To decrease the amount of requests that have to be sent.
 
Just wondering before testing.
Greetings.