TY  - GEN
AU  - Kersten,E
AU  - Ulrich,H
TI  - [Morbidity among apprentices with special reference to respiratory tract diseases, in relation to incidence, diagnosis and duration of disease during 9-years]
SN  - 0044-2178
PY  - 1976///1201
KW  - Adolescent
KW  - Age Factors
KW  - Germany, East
KW  - Humans
KW  - Occupational Diseases
KW  - diagnosis
KW  - Respiratory Tract Infections
KW  - Time Factors
KW  - Work Capacity Evaluation
N1  - Publication Type: Journal Article
ER  -