PT - JOURNAL ARTICLE ED - , TI - Verapamil reduced attack frequency and the use of abortive agents in episodic cluster headache AID - 10.1136/ebm.5.6.178 DP - 2000 Nov 01 TA - Evidence Based Medicine PG - 178--178 VI - 5 IP - 6 4099 - http://ebm.bmj.com/content/5/6/178.short 4100 - http://ebm.bmj.com/content/5/6/178.full SO - Evid Based Med2000 Nov 01; 5