Blais, L <br/><br/>
Confounding by indication and channeling over time: the risks of beta 2-agonists.  [electronic resource] 

 -  American journal of epidemiology  Dec 1996 
 - 1161-9 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0002-9262 
<br/><br/><label>Standard No.: </label>10.1093/oxfordjournals.aje.a008895  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Administration, Inhalation<br/>Adolescent<br/>Adrenergic beta-Agonists--adverse effects<br/>Adult<br/>Albuterol--adverse effects<br/>Asthma--drug therapy<br/>Child<br/>Cohort Studies<br/>Confounding Factors, Epidemiologic<br/>Epidemiologic Methods<br/>Fenoterol--adverse effects<br/>Humans<br/>Longitudinal Studies<br/>Middle Aged<br/>Risk Factors<br/>Severity of Illness Index