Given the task definition and input, reply with output. Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'MDS Nordion is headquartered in Ottawa , Ontario , with additional facilities in Quebec , British Columbia , Hong Kong , Japan , and Belgium .', Argument/Subject 1: 'md nordion', Argument/Subject 2: 'ottawa'
be headquarter in