ADDITIONAL PRESENTATION AND INDICATION: EMGALITY IS INDICATED FOR THE REDUCTION IN THE FREQUENCY OF ATTACKS THROUGHOUIT A CLUSTER PERIOD IN ADULTS WITH EPISODIC CLUSTER HEADACHE WITH PRIOR CLUSTER HEADACHE PERIODS LASTING AT LEAST 6 WEEKS AND WHO HAVE HAD AN INADEQUATE RESPONSE TO, OR TOLERATED POORLY, OF WHO HAD CONTRAINDICATIONS TO CONVENTIONAL PREVENTIVE THERAPIES ESTABLISHED Y CANADIAN PRACTICE GUIDELINES