Halpern, John H <br/><br/>
Reply to: 'illicit drugs and cluster headache: an inevitable discussion'.  [electronic resource] 

 -  Cephalalgia : an international journal of headache  May 2013 
 - 496-7 p.  digital 
<br/><br/> Publication Type: Letter; Comment 
<br/><br/><label>ISSN: </label>1468-2982 
<br/><br/><label>Standard No.: </label>10.1177/0333102413480753  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cluster Headache--epidemiology<br/>Female<br/>Humans<br/>Illicit Drugs<br/>Male<br/>Substance-Related Disorders--epidemiology