Authors: W E Rawls; J L Melnick; C M Bradstreet; M Bailey; A A Ferris; N I Lehmann; F P Nagler; J Furesz; R Kono; M Ohtawara; P Halonen; J Stewart; J M Ryan; J Strauss; J Zdrazilek; J Leerhoy; H Von Magnus; R Sohier; W Ferreira Journal: Bull World Health Organ Date: 1967 Impact factor: 9.408