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Br Med J (Clin Res Ed)
; 287(6407): 1772-4, 1983 Dec 10.
Article
in English
| MEDLINE
| ID: mdl-6416588
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J R Coll Gen Pract
; 33(248): 176, 1983 Mar.
Article
in English
| MEDLINE
| ID: mdl-6842441
3.
Br Med J
; 1(5900): 198, 1974 Feb 02.
Article
in English
| MEDLINE
| ID: mdl-4811851