Authors: M H Wahdan; S A Sallam; M N Hassan; A Abdel Gawad; A S Rakha; J E Sippel; R Hablas; W R Sanborn; N M Kassem; S M Riad; B Cvjetanović Journal: Bull World Health Organ Date: 1977 Impact factor: 9.408
Authors: H Peltola; H Mäkelä; H Käyhty; H Jousimies; E Herva; K Hällström; A Sivonen; O V Renkonen; O Pettay; V Karanko; P Ahvonen; S Sarna Journal: N Engl J Med Date: 1977-09-29 Impact factor: 91.245