Singer, M <br/><br/>
Variation in drug injection frequency among out-of-treatment drug users in a national sample.  [electronic resource] 

 -  The American journal of drug and alcohol abuse  May 1998 
 - 321-41 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. 
<br/><br/><label>ISSN: </label>0095-2990 
<br/><br/><label>Standard No.: </label>10.3109/00952999809001715  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humans<br/>Injections, Intravenous--statistics & numerical data<br/>Substance Abuse, Intravenous--epidemiology