Kersten, E <br/><br/>
[Morbidity among apprentices with special reference to respiratory tract diseases, in relation to incidence, diagnosis and duration of disease during 9-years].  [electronic resource] 

 -  Zeitschrift fur arztliche Fortbildung  Jan 1976 
 - 43-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0044-2178 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adolescent<br/>Age Factors<br/>Germany, East<br/>Humans<br/>Occupational Diseases--diagnosis<br/>Respiratory Tract Infections--diagnosis<br/>Time Factors<br/>Work Capacity Evaluation