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; 52(1): 1-11, 1981 Jan.
Article
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| MEDLINE
| ID: mdl-7012649
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; 127(3-4): 210-9, 1975.
Article
in German
| MEDLINE
| ID: mdl-1232967
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Helv Paediatr Acta
; 22(4): 376-89, 1967 Aug.
Article
in German
| MEDLINE
| ID: mdl-4301677