Maetzel, A <br/><br/>
Give observational studies a chance: better observational studies make better economic evaluations.  [electronic resource] 

 -  The Journal of rheumatology  Nov 1999 
 - 2298-9 p.  digital 
<br/><br/> Publication Type: Editorial 
<br/><br/><label>ISSN: </label>0315-162X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Antirheumatic Agents--adverse effects<br/>Evaluation Studies as Topic<br/>Health Care Costs<br/>Health Status<br/>Humans<br/>Rheumatic Diseases--drug therapy<br/>Treatment Outcome