Hackshaw, Allan, <br/><br/>
A concise guide to observational studies in healthcare / 
Allan Hackshaw. 
 - viii, 242 pages :  illustrations ;  23 cm. 
<br/><br/><label>ISBN: </label>9780470658673  RM163.66 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Observational Study as Topic--methods.<br/>Outcome and process assessment (Health care).<br/>Epidemiologic Research Design.